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Castillejos
Castillejos
Castillejos
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Castillejos, officially the Municipality of Castillejos (Ilocano: Ili ti Castillejos; Tagalog: Bayan ng Castillejos), is a municipality in the province of Zambales, Philippines. According to the 2024 census, it has a population of 70,105 people.[6]

Key Information

History

[edit]
Historical marker installed in 1955 at the municipal hall

Castillejos was established in 1743 by Tagalog settler families who migrated from Bataan.[7][8]

On April 22, 2019, a strong magnitude 6.1 earthquake occurred at 5:11 pm local time (UTC+08:00) according to PHIVOLCS.[9]

Geography

[edit]

Castillejos is located between San Antonio, Subic, and San Marcelino. It is 57 kilometres (35 mi) from Iba, 21 kilometres (13 mi) from Olongapo, and 147 kilometres (91 mi) from Manila.

Barangays

[edit]

Castillejos is politically subdivided into 14 barangays, as indicated below. [10] Each barangay consists of puroks and some have sitios.

  • Balaybay
  • Buenavista
  • Del Pilar
  • Looc
  • Magsaysay
  • Nagbayan
  • Nagbunga
  • San Agustin
  • San Jose (Poblacion)
  • San Juan (Poblacion)
  • San Nicolas
  • San Pablo (Poblacion)
  • San Roque
  • Santa Maria

Climate

[edit]
Climate data for Castillejos, Zambales
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean daily maximum °C (°F) 30
(86) 		31
(88) 		33
(91) 		34
(93) 		32
(90) 		31
(88) 		29
(84) 		29
(84) 		29
(84) 		30
(86) 		30
(86) 		30
(86) 		31
(87)
Mean daily minimum °C (°F) 19
(66) 		19
(66) 		20
(68) 		22
(72) 		24
(75) 		24
(75) 		24
(75) 		24
(75) 		24
(75) 		23
(73) 		21
(70) 		20
(68) 		22
(72)
Average precipitation mm (inches) 8
(0.3) 		9
(0.4) 		15
(0.6) 		34
(1.3) 		138
(5.4) 		203
(8.0) 		242
(9.5) 		233
(9.2) 		201
(7.9) 		126
(5.0) 		50
(2.0) 		21
(0.8) 		1,280
(50.4)
Average rainy days 3.7 4.1 6.5 11.2 21.2 24.9 27.7 26.5 25.5 21.8 12.6 5.6 191.3
Source: Meteoblue (Use with caution: this is modeled/calculated data, not measured locally.)[11]

Demographics

[edit]
Population census of Castillejos
YearPop.±% p.a.
1903 3,068—    
1918 4,491+2.57%
1939 5,362+0.85%
1948 7,699+4.10%
1960 10,049+2.24%
1970 14,807+3.95%
1975 17,999+3.99%
1980 19,154+1.25%
1990 26,753+3.40%
1995 28,357+1.10%
2000 33,108+3.38%
2007 42,910+3.64%
2010 48,845+4.83%
2015 64,841+5.54%
2020 67,889+0.97%
2024 70,105+0.77%
Source: Philippine Statistics Authority[12][13][14][15][16]

In the 2020 census, the population of Castillejos was 67,889 people,[17] with a density of 730 inhabitants per square kilometre or 1,900 inhabitants per square mile.

Economy

[edit]

Poverty incidence of Castillejos

5
10
15
20
25
30
2000
24.97
2003
14.23
2006
6.20
2009
12.47
2012
7.75
2015
18.15
2018
7.04
2021
17.88

Source: Philippine Statistics Authority[18][19][20][21][22][23][24][25]

Education

[edit]
Ramon F. Magsaysay Elementary School

The Castillejos Schools District Office governs all educational institutions within the municipality. It oversees the management and operations of all private and public, from primary to secondary schools.[26]

Primary and elementary schools

[edit]
  • Balaybay Elementary School
  • Balaybay Resettlement Elementary School
  • Buenavista Elementary School
  • Castillejos Aldergate Learning Center
  • Castillejos Elementary School
  • Del Pilar Elementary School
  • Guardian Angel Child Development Center
  • Hanniel Christian Academy
  • Kanaynayan Community School
  • Looc Elementary School
  • Magsaysay Elementary School
  • Maranatha Christian Academy
  • Mia Angela Montessori
  • Nagbayan Elementary School
  • Precious Child Montessori (Main)
  • Precious Child Montessori (Annex)
  • Pres. Ramon F. Magsaysay Elementary School
  • San Agustin Elementary School
  • San Isidro Elementary School
  • San Nicolas Primary School
  • Santa Maria Elementary School
  • St. Nicholas Academy
  • Sta. Maria Elementary School
  • To God Be the Glory Christian Academy
  • V. Gallardo Elementary School
  • Villaflor Elementary School

Secondary schools

[edit]
  • Castillejos National High School
  • Castillejos Resettlement High School
  • Hanjin Integrated School
  • Jesus F. Magsaysay Technical Vocational High School
  • Looc Integrated School
  • Precious Heritage of Zambales
  • San Agustin High School
  • St. Nicholas Academy

Higher educational institution

[edit]
  • President Ramon Magsaysay State University

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Castillejos

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from Grokipedia
Castillejos, officially the Municipality of Castillejos, is a landlocked municipality in the province of in the region of the . It covers an area of 92.99 square kilometers and is divided into 14 barangays, with a population of 70,105 according to the 2024 census, resulting in a density of 754 inhabitants per square kilometer. The municipality is situated at coordinates 14°56′N 120°12′E, with an average elevation of 50.7 meters, and serves as a gateway for tourists exploring due to its proximity to coastal areas like . Founded in 1743 as a pueblo by Tagalog families from , Castillejos was initially named Uguic (later spelled Uguit) and gained ecclesiastical independence on January 23, 1863, when it received its own parish priest, prompting its renaming to Castillejos after the Spanish Battle of Castillejos fought in in 1860. The area experienced boundary disputes with neighboring Subic, resolved in 1897–1898, and briefly lost political independence between 1904 and 1910 when it was consolidated with adjacent towns before regaining autonomy. Castillejos is particularly renowned as the childhood home of , the seventh (serving 1953–1957), whose ancestral house in Santa Maria now operates as the Museo ni Ramon Magsaysay, preserving artifacts from his life and legacy. The local economy is predominantly agricultural, with approximately 3,894 hectares (about 42% of the total land area of 9,299 hectares) dedicated to farming, primarily and other crops, supported by initiatives like farm machinery distribution and greenhouse projects to boost productivity. Tourism is an emerging sector, driven by the Magsaysay museum, nearby resorts, and eco-tourism opportunities, aligning with the municipality's vision of a progressive agro-industrial hub with resilient communities and efficient public services. The annual regular revenue in 2016 stood at ₱145,730,567.36, reflecting steady growth from a historical population of just 3,068 in 1903.

History

Establishment and Colonial Period

Castillejos was founded in 1743 by Tagalog settler families who migrated from province under Spanish colonial administration, seeking safer inland locations away from coastal pirate threats near [Subic Bay](/page/Subic Bay). These early settlers established the community initially as a visita dependent on the nearby pueblo of Subic, integrating into the broader administrative structure of province, which had been organized by Spanish authorities in the to facilitate control over the region's resources and indigenous populations. The settlement, originally known as Uguic or Uguit, reflected typical Spanish colonial patterns of formation, where migrants received land through informal grants and systems to encourage agricultural development and . Missionary influences played a key role in the community's early consolidation, with Franciscan and later Augustinian Recollect priests promoting religious conversion among the settlers and local Aeta populations. By 1802, the earliest surviving archival record documents Don Ignacio de San Agustin serving as the first recorded gobernadocillo, overseeing communal planting initiatives from 1799 to 1802 as part of Spanish efforts to bolster food security in the colony. In 1842, additional settlement occurred when 14 Ilocano families were granted permission by Alcalde Don Prudencio Perez de Nenon to establish Barrio San Marcelino, further diversifying the population under Spanish land allocation policies. Territorial adjustments during this period included the separation of San Narciso in 1846 and San Antonio in 1849 as independent pueblos, reducing Castillejos' original boundaries. During the Philippine Revolution, Castillejos residents participated in local resistance efforts, including boundary affirmations with Subic amid revolutionary upheavals. On January 24, 1863, the achieved ecclesiastical independence from Subic with the appointment of its own resident , Father Pablo Calvillo, who served until the end of Spanish rule in 1898; the renaming to Castillejos had occurred the previous day, on January 23, 1863, honoring the Spanish victory at the Battle of Castillejos in . Boundary disputes with Subic were resolved in 1897, with final demarcation by 1898, solidifying its administrative identity within . During the transition to American colonial rule, Castillejos was temporarily consolidated with neighboring areas but regained political independence as a formal on January 1, 1910, aligning with U.S. efforts to reorganize local governance for efficiency.

Modern Developments and Events

Following , Castillejos played a supportive role in ' regional recovery and development through its strategic proximity to , where the reestablishment of the U.S. naval base in the late 1940s spurred economic activity across the province. The intact transportation left by American forces, including roads and port facilities, facilitated trade and logistics, positioning Castillejos as a key link in the post-war for agricultural goods and materials from northern towns. After Philippine independence in 1946, Castillejos experienced minimal administrative changes, retaining its municipal status established in 1910, but underwent significant economic shifts due to its location adjacent to . The U.S. naval base's operations until 1992 provided indirect employment and commerce opportunities for residents, with local markets benefiting from base-related spending on supplies and services. Following the base's closure, Republic Act No. 7227 in 1992 converted the area into the Subic Bay Freeport Zone under the (SBMA), transforming it into an economic special zone focused on manufacturing, logistics, and tourism. As a contiguous unit to the freeport, Castillejos receives a 2% share of the SBMA's 5% gross income tax allocation under Republic Act No. 9400, funding local infrastructure and services to support spillover economic growth. This has driven a population increase tied to job opportunities in the zone, with the municipality's residents comprising part of the freeport's 164,400-strong workforce as of 2024. Urbanization in Castillejos accelerated in the late 20th and early 21st centuries, fueled by the freeport's expansion and improved connectivity via highways linking the municipality to Olongapo City and the zone. This led to the growth of roadside commercial hubs, including the introduction of national retail chains and the development of the area's first community mall in the , reflecting broader regional trends in retail and service sector expansion. Fast-food outlets from major Philippine brands also emerged during this period, catering to commuters and workers commuting to facilities. On April 22, , a magnitude 6.1 struck with its epicenter approximately 18 kilometers northeast of Castillejos at 15.02°N, 120.34°E, causing widespread shaking across and neighboring provinces. In Castillejos, the quake damaged several public and private structures, including schools and homes, with reports of cracked walls, fallen debris, and temporary power outages affecting over 1,500 families in the municipality. No fatalities or injuries were reported locally, though the event contributed to a regional total of 18 deaths and 245 injuries across affected areas. Recovery efforts in Castillejos were swift, coordinated by the Department of Social Welfare and Development (DSWD) and , which provided emergency aid including food packs, sleeping mats, and financial assistance to 1,512 affected families by April 24, 2019. The Philippine Red Cross deployed rescue teams, ambulances, and generators to support operations, while structural assessments led to the repair of damaged infrastructure, such as school buildings, with full restoration aided by national disaster funds within months.

Geography

Location and Terrain

Castillejos is situated in the province of , region, , at geographic coordinates approximately 14.93°N 120.2°E. The municipality covers a total land area of 92.99 square kilometers. It is bounded by to the north, Subic to the south, and to the east, with the influencing its western coastal proximity. The terrain of Castillejos features coastal plains along its western edge near , transitioning to hilly interiors in the central and eastern portions. These landscapes have been shaped by the , located approximately 50 kilometers southeast, which deposited materials that altered river courses and soil composition across . Elevations in Castillejos range from along the coastal plains to over 800 in the eastern mountainous areas, with an average of about 63 . The municipality's soils, conducive to , include Angeles fine sand (covering 60% of the area in the west, suitable for , , , and root crops), Quingua silt (31% in the northeast, ideal for , , and fruit trees), and Antipolo clay (10% in the east, supporting and fruit trees), alongside rough mountain soils in the easternmost zones.

Administrative Divisions

Castillejos is a within the province of , which falls under the region (Region III) of the . As one of 13 municipalities in , it operates under the standard Philippine local government structure, with barangays serving as the basic political and administrative units. The municipality is politically subdivided into 14 barangays, each comprising puroks and, in some cases, sitios. These are: Balaybay, Buenavista, Del Pilar, Looc, Magsaysay, Nagbayan, Nagbunga, San Agustin, San Jose, San Juan, San Nicolas, San Pablo, San Roque, and Santa Maria. Among these, San Jose serves as the town proper, formerly known as , and functions as the central administrative hub of the municipality. San Pablo is the largest barangay by land area, characterized by its mountainous terrain and extensive hardwood forests, while Looc is the farthest from the town center at approximately 7 kilometers and features notable landmarks such as Looc Lake and the Carmelites Church. San Juan is situated in the poblacion area, contributing to the core urban zone. No significant changes to barangay boundaries have been recorded in Castillejos since its reestablishment as an independent in 1910. The administrative divisions reflect the varied terrain, with several upland s adapted to hilly landscapes.

Climate and Environment

Castillejos features a classified under the Köppen system as Am, characterized by high temperatures and distinct wet and dry seasons. Average high temperatures reach 31°C, while lows average 22°C throughout the year, with minimal seasonal variation due to the equatorial proximity. Annual precipitation totals approximately 1,280 mm, predominantly occurring during the from May to , when southwest monsoons and s bring heavy rains. The dry season spans to , with significantly reduced rainfall, though occasional s can influence patterns year-round. data for Castillejos relies heavily on modeled estimates from sources like the World Bank Knowledge Portal, as the area lacks dedicated local stations for direct measurements. These models highlight vulnerability to , including intensified activity under projections. The region faces environmental challenges from seismic activity, exemplified by the 6.1-magnitude centered near Castillejos in April 2019, which triggered landslides and that disrupted local ecosystems and vegetation cover. Proximity to enhances biodiversity, with adjacent protected forests supporting diverse flora and fauna, including over 700 plant species and key bird habitats in the Subic Bay Watershed Forest Reserve.

Government and Administration

Local Governance Structure

Castillejos operates as a first-class as of March 2025, following its reclassification under Republic Act No. 11964 (Automatic Income Classification of Local Government Units Act), which updates the framework for local governance in the by categorizing municipalities based on average annual regular income. This places Castillejos in the first tier, with income of 200 million or more, enhancing its fiscal autonomy and administrative capacities. The municipal government is led by an elected , currently Jeffrey D. Khonghun, who assumed office on July 1, 2022, and was re-elected in the May 12, 2025, local elections for a term ending June 30, 2028. The vice mayor, Christian Niño Esposo, presides over the , the legislative body comprising eight elected members responsible for enacting ordinances and approving budgets. The current members, elected in 2025, include Oda Roldan-Guevara, Romeo Calimlim II, Ramon Valdez, Voltaire Avera, John-John Felarca, Jorge Ablao, Chito Villanueva, and Dennis Mapalo. At the barangay level, Castillejos is divided into 14 administrative units, each governed by an elected and a seven-member , along with a for youth representation. These barangays—Balaybay, Buenavista, Del Pilar, Looc, Magsaysay, Nagbayan, Nagbunga, San Agustin, San Jose, San Juan, San Nicolas, San Roque, Sibuyan, and Capunitan—handle grassroots administration, including community services and dispute resolution. Local elections in Castillejos follow the national cycle under the Local Government Code, occurring every three years on the second Monday of May in years, with officials serving three-year terms limited to three consecutive terms. The most recent elections were held on May 12, 2025, determining officials for 2025–2028. The governance structure post-1910 reflects Castillejos's reestablishment as an independent following its brief consolidation with neighboring areas under Philippine Commission Act No. 945 in 1907; independence was restored in 1910, marking the start of formalized local leadership. Early leaders held the title of "president" until the shift to "" in 1941, with officers-in-charge appointed during transitional periods like the post-martial law era. A chronological overview of mayors since 1910 is as follows:
MayorTerm
Edilberto de Perio1910–1912
Juan L. del Fierro1913–1915
Juan Gallardo1915–1921
Juan Blanco1922–1940
Felix Fallorina1941–1948
Sixto Cacho1949–1953
Tranquilino Velasco1954–1955
Tomas Ablao1956–1965
Dominador Bundang1966–1967
Rodrigo Trimor1967–1986
Manuel Felarca (OIC)1986–1987
Flordeliza C. Trinidad (OIC)1988
Enrique P. Magsaysay1989–1992; 2002–2004
Teofilo G. Pantaleon1992–2000
Wilma D. Billman2000–2001 (OIC); 2001–2002; 2004–2010
Enrique C. Clarin (Acting)2006
Jose Angelo M. Dominguez2010–2019
Eleanor D. Dominguez2019–2022
Jeffrey D. Khonghun2022–present
This sequence highlights continuity in democratic elections, with occasional interim appointments during political transitions.

Public Services and Officials

Jeffrey D. Khonghun has served as mayor of Castillejos since June 30, 2022, following his election in 2022 and re-election in May 2025. His administration emphasizes a vision of a progressive municipality with resilient communities, sustainable infrastructure, and proactive leadership, alongside a mission to deliver gender-responsive and efficient public services. Prior to Khonghun, Jose Angelo Dominguez held the mayoral position, focusing on local development before the 2022 transition. Public services in Castillejos are managed through key municipal offices under the local government's oversight. The Municipal Health Office, located in San Agustin, offers outpatient consultations, issues medico-legal certificates and sanitary permits, and supports unit operations to address needs. The Municipal and Management Office (MDRRMO) handles emergency responses, including patient transport, debris clearing, and programs, while issuing certificates to enhance following events like the 2019 magnitude 6.1 earthquake that struck near the municipality. Additionally, the Municipal Social Welfare and Development Office oversees community programs, such as family for vulnerable groups and , to foster social resilience. Under Mayor Khonghun's leadership, notable initiatives include infrastructure improvements like the groundbreaking for a new municipal hall in 2024, aimed at enhancing administrative efficiency and public access. Poverty alleviation efforts are integrated into social welfare programs, with distributions of essential resources coordinated through the MSWDO to support low-income households. Health-related community outreach, such as the 2025 Operation Tuli program, provides free medical services to promote preventive care. The municipality interacts with the Zambales provincial government for regional service delivery, particularly in and coordinated training through bodies like the Provincial and Management Council, ensuring aligned efforts in emergency preparedness and resource sharing. This supports local initiatives, such as post-earthquake resilience building, by leveraging provincial expertise and funding.

Demographics

The population of Castillejos has experienced steady growth over the past century, driven by natural increase and migration from nearby urban areas such as . According to historical records, the population stood at 3,068 in 1903. By the 2020 census conducted by the (PSA), it had risen to 67,889, marking an average annual growth rate of approximately 2.7% from 1903 to 2020. The 2024 PSA census recorded a further increase to 70,105 as of July 1, 2024, reflecting an annual growth rate of about 0.81% from 2020 to 2024. This growth has resulted in a of 753.9 inhabitants per square kilometer in 2024, influenced by the municipality's land area of approximately 93 square kilometers. trends are evident, with a rising proportion of the residing in more developed barangays near major thoroughfares, contributing to denser settlement patterns. The 2024 census highlights include a total of 70,105 residents across 14 barangays, underscoring the municipality's position as one of the more populous areas in province. Household data from the 2020 provides insight into living arrangements, with 16,942 households and an average household size of 4.00 members, a slight increase from 3.76 in 2015, indicating stable family structures amid expansion. Preliminary indicators from the 2024 suggest continued trends in household formation, though detailed breakdowns are pending full PSA release. Based on PSA projections derived from the 2020 and recent growth patterns, the is estimated to reach around 70,800 by mid-2025.
YearPopulationAnnual Growth Rate (from previous major census)Density (per km²)
19033,068--
202067,8892.7% (1903–2020 average)730
202470,1050.81% (2020–2024)753.9

Socioeconomic Characteristics

Castillejos exhibits a poverty incidence of 17.88% among its in 2021, lower than the national average but reflecting challenges in rural areas with limited access to resources. This rate, derived from estimates, indicates that approximately one in six residents lived below the , with higher incidences noted in agricultural-dependent barangays such as those in the upland areas. Supporting a total of 67,889 as per the 2020 , these figures underscore ongoing efforts to address socioeconomic disparities through local programs. The social composition of Castillejos is diverse yet predominantly Tagalog-speaking, reflecting migration patterns from nearby provinces, with significant Ilocano and minorities contributing to cultural vibrancy. About 37.84% of the provincial household population identifies as Tagalog and 27.46% as Ilocano, trends mirrored in Castillejos due to its historical settlement by Tagalog families from and interprovincial movements. Sambal communities, indigenous to , form a notable minority, alongside small Aeta populations totaling around 1,600 individuals across select barangays like San Pablo and Balaybay. Religion plays a central role in community life, with Roman Catholicism predominant at 80.20% of the population, fostering traditions such as processions and parish activities that strengthen social bonds. Other Christian denominations, including at 6.78% and Protestants at 2.32%, coexist alongside minor groups like other Christians (7.46%) and (0.40%), promoting interfaith through shared community events. Health and literacy rates in Castillejos have demonstrated resilience and incremental improvements following the 2019 onset of the , with enhanced public health initiatives aiding recovery. The basic rate among those aged five and older aligns with the national figure of 96%, while functional for ages 10 to 64 stands at around 70%, supported by accessible and community programs that mitigated pandemic disruptions. Health indicators, including access to , have benefited from post-pandemic recovery efforts, such as support for 31 clients in 2022 and broader drives, contributing to stabilized and reduced vulnerabilities in rural sectors.

Economy

Primary Sectors and Resources

Agriculture remains the cornerstone of Castillejos's primary economic sectors, utilizing approximately 3,894.44 hectares—or 41.9% of the municipality's total 9,299-hectare land area (92.99 km² based on Land Management Bureau data as of 2013)—for cultivation. The region's diverse soil types, including Angeles fine sand, Quingua silt loam, clay, and mountain soils, facilitate the production of key crops such as lowland and , , , root crops, and various trees on the coastal plains. Fishing constitutes another vital primary sector, leveraging Castillejos's proximity to and inland water bodies like Looc Lake, where local fisherfolk engage in capture fisheries as a traditional . In communities around Looc Lake, fishing accounts for a notable portion of household income, often complementing agricultural activities. Natural resources in the hilly and mountainous terrains support limited forestry, with abundant hardwood species such as narra, calantas, apitong, tanguile, and guijo found in areas including Sitio Canaynayan in Barangay San Pablo, Barangay Looc, and Barangay San Agustin. Minor non-timber products like and are also harvested, with efforts focused on to prevent . These primary sectors employ a substantial share of the local workforce, mirroring regional trends in where agriculture, , and together represent 11.5% of the provincial GDP. However, the area faces significant challenges from variability, particularly during the (May to December), which frequently damage crops, disrupt fishing operations, and reduce yields, as evidenced by the impacts of in 2023, which affected over 220 farmers and fishermen in province.

Commerce and Development

The commercial sector in Castillejos has seen steady growth, driven by its strategic location adjacent to the Freeport Zone, which facilitates trade and logistics activities for local businesses. In 2022, the municipality generated ₱341.9 million in revenue, sourced primarily from local taxes, business permits, and shares from national tax collections allocated through mechanisms like the . This fiscal foundation supports ongoing economic modernization efforts, positioning Castillejos as a third-class with potential for upward mobility in income classification. Key developments include the expansion of retail infrastructure, exemplified by the transformation of RM Mall into Castillejos Commons, a modern community retail center scheduled to open in 2025 and featuring diverse commercial spaces to attract regional shoppers. The influx of national retail chains, such as multiple outlets along major thoroughfares, underscores the rising vibrancy of the local market and increased consumer accessibility. These initiatives contribute to strategies outlined in the municipality's 2021-2025 development framework, which emphasize through job creation in services and trade, alongside targeted social programs to lower the poverty incidence rate of 17.88% recorded in 2021. Looking ahead, Castillejos is pursuing plans that blend commerce with eco-tourism, including the enhancement of the eco-park in Balaybay through community-led and infrastructure improvements to promote nature-based attractions. Proximity to also enables explorations into industrial zones focused on light manufacturing and , aiming to diversify revenue streams and foster long-term economic resilience without over-reliance on primary sectors.

Education

Primary and Secondary Education

Primary and secondary education in Castillejos is overseen by the Castillejos District Office under the Schools Division of Zambales of the Department of Education (DepEd). The district manages public schools offering the K-12 basic education program, emphasizing foundational skills in literacy, numeracy, and values formation. Public elementary education serves students from kindergarten through Grade 6 across 15 schools, including Castillejos Elementary School, Balaybay Resettlement Elementary School, Looc Elementary School, and President Ramon F. Magsaysay Elementary School. These institutions focus on core subjects like language, mathematics, science, and social studies, with facilities upgraded following the 2019 magnitude 6.1 earthquake that struck near Castillejos, causing damage to school buildings in Zambales. Enrollment in elementary levels aligns with provincial trends, supporting a high basic literacy rate of around 96% in Zambales as of 2015, indicative of effective foundational education. Public secondary education covers Grades 7 to 12 in four main schools, such as Castillejos National High School and Jesus F. Magsaysay Technical Vocational High School. Castillejos National High School, for instance, has seen steady enrollment growth since its early years, serving hundreds of students with programs in academic tracks and technical-vocational specializations like agriculture and industrial arts. The Jesus F. Magsaysay Technical Vocational High School emphasizes practical skills training integrated into the senior high school curriculum, preparing students for local employment or further studies. Post-earthquake assessments and repairs ensured the safety and functionality of these facilities, with DepEd reporting over 300 public schools affected province-wide but restored for continued operations. Private institutions complement public offerings, including St. Nicholas Academy of Castillejos, Inc., which provides education from elementary to secondary levels with a focus on holistic development, and Christian Academy Castillejos Chapter for faith-based primary and secondary instruction. Vocational training at the secondary level is also available through specialized tracks in public high schools, bridging to higher education pathways.

Higher Education and Institutions

The (PRMSU) operates a in Castillejos, established in 2003 as an LGU-subsidized initiative to expand access to higher education in . This campus focuses on undergraduate programs in education and business-related fields, including the Bachelor of Elementary Education, Bachelor of Secondary Education (majors in English and ), Bachelor of Science in Accounting Technology, in Business Administration (major in ), and in Social Science. These offerings align with the university's mandate to provide professional, technical, and special instructions in key disciplines. The Castillejos campus promotes local access to postsecondary for residents of the and surrounding areas, reducing the need for students to travel to the main Iba campus or urban centers. As a state , it benefits from the Universal Access to Quality Tertiary Education Act of 2017, providing free tuition for first-time students in accredited programs, with miscellaneous fees applying. Enrollment supports community retention of talent, though specific figures remain internal to the administration. Graduation outcomes are reflected in board exam performance, where the campus contributes to PRMSU's overall institutional rankings in and accountancy licensure examinations. Scholarships enhance affordability and equity, with programs like the ZAMECO II Scholarship available to bonafide students across PRMSU campuses, including Castillejos, targeting those pursuing bachelor's degrees based on financial need and academic merit as defined by the Zambales II Electric Cooperative. The university fosters partnerships with local government units and the Department of Education to subsidize operations and align curricula with regional demands, though formal ties to national universities are coordinated through the Commission on Higher Education for accreditation and faculty development. PRMSU's extension programs, managed university-wide, play a vital role in by generating appropriate technologies and serving as a catalyst for empowering communities toward sustainable livelihoods and improved quality of life. At the Castillejos campus, these efforts include collaborative initiatives on environmental and , fostering local partnerships for practical outreach in and .

Infrastructure

Transportation and Connectivity

Castillejos benefits from its strategic location along key road networks that facilitate connectivity to nearby economic centers. The primary thoroughfare is the Olongapo–Bugallon Road, a national highway designated as Radial Road 6, which traverses the municipality and directly links it to and to the south, while providing access northward toward the provincial capital of Iba. This road forms part of the broader route to , approximately 140 kilometers away, via the (SFEX) and the (SCTEX), reducing travel times for commuters and goods transport. Public transportation in Castillejos relies on a mix of local and inter-municipal options suited to its rural-urban character. Jeepneys serve intra-barangay routes and connect to , while tricycles provide short-distance travel within neighborhoods and to nearby markets. Bus services, operated by companies like , run regular routes from Castillejos to Iba (about 55 kilometers north), with fares starting at around ₱200, offering air-conditioned and ordinary options for daily commuters and visitors. The municipality's proximity to enhances its logistical advantages, with the and Port located roughly 20 kilometers south, accessible via the – Road in under 30 minutes by car. These facilities support cargo and passenger movements, bolstering trade links to and beyond. The magnitude 6.1 earthquake centered near Castillejos on April 22, 2019, resulted in cracks and disruptions to local roads and the nearby SCTEX, prompting immediate response from the Department of Public Works and Highways (DPWH). Rehabilitation efforts swiftly restored access, with all affected roads and bridges reopened within days through emergency repairs. Subsequent development plans have focused on resilience, including the concreting of local roads like the 0.926-kilometer access road from Barangay San Jose to Barangay San Pablo completed in 2022 to improve mobility and reduce maintenance costs, alongside projects to mitigate future traffic vulnerabilities and support economic recovery.

Utilities and Public Facilities

Electricity in Castillejos is supplied by the Zambales II Electric Cooperative (ZAMECO II), a member-owned utility that covers the municipality along with neighboring areas such as , San Felipe, , , San Narciso, and Subic. ZAMECO II focuses on providing reliable and affordable power, with recent adjustments in rates reflecting efforts to manage costs for residential and commercial consumers, such as a reduction to approximately ₱6.71 per kWh effective October 2025. While specific rates for Castillejos are not detailed in public reports, the cooperative's infrastructure ensures broad access across the 14 barangays, supporting both urban and rural households. initiatives within ZAMECO II's operations remain limited, though national policies encourage integration of solar and other sources to enhance . Water supply is managed by the Castillejos Water District (CSWD), a local government-initiated utility established to deliver potable through a Level III featuring individual metered connections. The district operates from its main office in Barangay Nagbunga and sub-stations in areas like San Agustin, emphasizing efficient distribution and maintenance to support , , and economic activities. sources primarily draw from local and possibly nearby rivers, with efforts to expand access including water hauling services during shortages and community pumps for remote indigenous areas. Access remains rotational in some zones to optimize limited resources, though exact percentages vary by barangay. Healthcare services in Castillejos are centered on the Castillejos Unit (RHU), a government-operated facility in San Agustin that provides , including maternal and , , and treatment for common illnesses as an accredited YAKAP under PhilHealth. Supported by a team of physicians, nurses, and midwives, the RHU coordinates with health centers distributed across the 14 barangays, where workers deliver grassroots services like and basic check-ups. For specialized or emergency care, the RHU refers patients to affiliated hospitals in nearby Olongapo City, such as the James L. Gordon Memorial Hospital and Baypointe Hospital & Medical Center, ensuring continuity of care for the municipality's 67,889 residents as of the 2020 census. Public facilities include the Castillejos Public Market in San Juan (Poblacion), a key venue for fresh produce, goods, and local commerce that was upgraded in recent years to better serve daily needs. Community spaces feature the municipal park and plaza in Barangay San Nicolas, used for gatherings, events, and recreation to foster social cohesion. Following the 6.1-magnitude earthquake in April 2019 that affected , local governance has prioritized disaster resilience, updating public buildings like evacuation centers and the municipal hall extension with reinforced structures and early warning integrations to mitigate risks from typhoons and seismic events.

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