Economy of California

The economy of the State of California is the largest in the United States, with a $4.048 trillion gross state product (GSP) as of 2024. It is the largest sub-national economy in the world. If California were an independent nation, it would rank as the fourth largest economy in the world in nominal terms, behind Germany and ahead of Japan.

California's Silicon Valley is home to some of the world's most valuable technology companies, including Apple, Alphabet, and Nvidia. As of June 2025, 58 of the Fortune 500 companies are headquartered in California.

As both the most populous US state and one of the most climatologically diverse states, the economy of California is varied, with many sizable sectors. The most dominant of these sectors include finance, business services, government and manufacturing. Much of the economic activity is concentrated in the coastal cities, especially Los Angeles, which has a relative focus on media—most notably Hollywood—and the San Francisco Bay Area, which predominantly concentrates on technology. Both cities, along with other major ports such as San Diego, also act as significant trade hubs to and from the United States. Furthermore, California's agriculture industry has the highest output of any U.S. state, with its Central Valley being one of the most productive agricultural regions on Earth, growing over half the country's fruits, vegetables, and nuts. Droughts in California are affecting business and industry in addition to agriculture.

This list shows nominal gross domestic product (GDP) by county in millions of US$, in 2022.

California has experienced waves of migration in the past. Once the Treaty of Guadalupe Hidalgo of 1848 was coercively signed with Mexico, the US acquired the future states of California, Nevada, Utah, Arizona, New Mexico as well as the independent territory of Texas the newly acquired territories underwent rapid and extensive development. In 1847, California was controlled (with much difficulty due to deserters leaving to look for gold) by a U.S. Army-appointed military governor and an inadequate force of a little over 600 troops. After the finding of extensive gold deposits in California, the California gold rush started in 1848. Commerce and economic activity in California initially centered around the vastly expanded cities of San Francisco, San Jose, and Sacramento as they scrambled to supply the hordes of gold miners. Meanwhile, Los Angeles initially remained a less populated settlement with fewer than 5,000 residents.

Prior to 1850, the government was judged inadequate and poorly run, and statehood status was sought to start trying to remedy this problem. Due to the California Gold Rush, by 1850 California had grown to have a non-Indian and non-Californio population (about 7,000 Californios were residing in California in 1850) of over 110,000. Despite a major conflict in the U.S. Congress on the number of slave versus non-slave states, the large, rapid and continuing California population gains and the large amount of gold being exported east gave California enough clout to choose its own extensive boundaries, elect its representatives and senators, write its Constitution, and be admitted to the Union as a free state in 1850 without going through territorial status as required for most other new states.

Soon after gaining statehood in 1850, the state required and paid through taxes for nearly universal elementary school education. Other private schools were founded and are still doing well. In the 1930s California was a leader in the high school movement to educate students beyond elementary school. State-subsidized college educations have a long history in California as well as many private elementary, middle, high schools, colleges and universities. There are three public funded higher education systems in the state: the California State University (CSU) (founded 1857), the University of California (UC) system (founded 1868), and the California Community College System (CCCS) founded in 1967. CSU is the largest university system in the United States. CSU has 23 campuses and eight off-campus centers enrolling 437,000 students with 44,000 faculty members and staff, The University of California was founded in 1868 in Berkeley as a state supported university. As of fall 2011, the University of California has 10 campuses, a combined student body of 234,464 students, 18,896 faculty members, 189,116 staff members, and over 1,600,000 living alumni. The California Community College System consisting of 112 community colleges in 72 community college districts in California has over 1,800,000 students. California also has an extensive private college system of over 133 colleges and universities including California Institute of Technology (Caltech) and Stanford University. (See: List of colleges and universities in California)

About half the settlers coming to California after 1846 came by the wagon trains on the California Trail (a trip of about 140–160 days). The other half came by sea via paddle steamers going to and from the Isthmus of Panama or Nicaragua (about a 40+ day trip). The building of the Panama Railroad in 1855 made this a much more used route especially for passengers. The other main sailing ship route was going around Cape Horn, about a 120-day (via Clippers) or 200 day trip by regular sailing ship. Nearly all freight to California till 1869 took this long route around South America—shipping by ship has nearly always been relatively slow but cheap. Overland shipping was too difficult and took too long for nearly all cargo. The First Transcontinental Telegraph replaced the Pony Express in 1861 and established the first rapid communication with the east coast. The First transcontinental railroad was completed across the future states of Nebraska, Wyoming, Utah and the new states of Nevada (est. 1864) and California in 1869 and cut this trip to about 7 days. This rail link tied California and the rest of the Pacific states firmly into the union and led to much more rapid and profitable commerce between the states. In 1886 the first refrigerated cars on the Southern Pacific Railroad entered operation. The loading of such cars with oranges, at Los Angeles on February 14, 1886, started an economic boom in the citrus industry of Southern California, by making deliveries of perishable fruits and vegetables to the eastern United States possible.^{[citation needed]}