Ogle County, Illinois

Ogle County is a county in the northern part of the U.S. state of Illinois. According to the 2020 United States census, it had a population of 51,788. Its county seat is Oregon, and its largest city is Rochelle. Ogle County comprises Rochelle, IL Micropolitan Statistical Area, which is also included in the Rockford-Freeport-Rochelle, IL Combined Statistical Area.

Ogle County was formed in 1836 out of Jo Daviess and LaSalle counties, and named in honor of Captain Joseph Ogle, a veteran of the Revolutionary War who settled in Illinois in 1785. Ogle County government was organized in 1837; before that time it remained assigned to Jo Daviess County for legislative, taxation, and judicial matters. In 1839, part of Ogle County was partitioned off to form Lee County.

Ogle County was a New England settlement. The founders of Oregon and Rochelle arrived from New England; they were "Yankees", descendants of English Puritans who had settled New England in the 1600s. They were part of a wave of farmers who migrated into the Northwest Territory in the early 1800s, their trek eased by completion of the Erie Canal in 1825. They found virgin forest and wild prairie, and quickly laid out farms, constructed roads, erected government buildings and established post routes. They brought a passion for education and strong abolitionism. They were members of the Congregationalist or Episcopalian Church. Culturally Ogle County, like much of northern Illinois would maintain values similar to those of New England.

According to the US Census Bureau, the county has a total area of 763 square miles (1,980 km²), of which 759 square miles (1,970 km²) is land and 4.4 square miles (11 km²) (0.6%) is water.

In recent years, average temperatures in Oregon have ranged from a low of 10 °F (−12 °C) in January to a high of 82 °F (28 °C) in July, although a record low of −27 °F (−33 °C) was recorded in January 1999 and a record high of 110 °F (43 °C) was recorded in July 1936. Average monthly precipitation ranged from 1.43 inches (36 mm) in February to 4.88 inches (124 mm) in June.

As of the 2010 United States census, there were 53,497 people, 20,856 households, and 14,711 families residing in the county. The population density was 70.5 inhabitants per square mile (27.2/km²). There were 22,561 housing units at an average density of 29.7 per square mile (11.5/km²). The racial makeup of the county was 93.2% white, 0.9% black or African American, 0.5% Asian, 0.2% American Indian, 3.8% from other races, and 1.4% from two or more races. Those of Hispanic or Latino origin made up 8.9% of the population. In terms of ancestry, 38.0% were German, 15.3% were Irish, 10.2% were English, 6.4% were American, 5.3% were Swedish, and 5.3% were Norwegian.

Of the 20,856 households, 33.1% had children under the age of 18 living with them, 56.1% were married couples living together, 9.7% had a female householder with no husband present, 29.5% were non-families, and 24.5% of all households were made up of individuals. The average household size was 2.54 and the average family size was 3.01. The median age was 40.7 years.

The median income for a household in the county was $55,733 and the median income for a family was $64,927. Males had a median income of $49,996 versus $32,082 for females. The per capita income for the county was $24,959. About 6.6% of families and 8.9% of the population were below the poverty line, including 12.4% of those under age 18 and 5.9% of those age 65 or over.