Demographics
Who are the people of San Joaquin County?
18.9%
San Joaquin County’s population is projected to grow by about 19% between 2025 and 2050, reaching 956,344 residents.
36.2
The median age in San Joaquin County is 36.2 years as of 2024, about 5.7% lower than California’s median age of 38.4.
28.1%
Of San Joaquin County’s population was under age 20 in 2024, while 14% was 65 or older.
Demographics
Age Distribution
San Joaquin County’s age distribution reveals a relatively young population, with 28% of residents under the age of 20 and 47% between the ages of 20 and 54. The 55-64 age group accounts for 11% of the population, while those 65 and older make up 14%. This age structure has implications for planning and allocating resources in a variety of fields, such as education, adult care, childcare, workforce development, and healthcare services.
28.1%
28.1% of San Joaquin County’s population was under 20 years old in 2024, compared with 24.0% for California as a whole.
Population forecast
San Joaquin County’s population is expected to grow steadily over the coming decades. The population is projected to reach 839,888 by 2030, 895,516 by 2040, and 956,344 by 2050. This growth will require strategic planning to ensure adequate affordable housing, quality jobs, infrastructure, and public services are available to meet the needs of the expanding population.
11.4%
San Joaquin County’s population is forecast to increase by about 11.4% between 2025 and 2040, from 804,252 people to 895,516
Median Age
San Joaquin County’s median age has been gradually increasing, from 32.7 years in 2010 to 36.2 years in 2024. This trend is consistent with the population of California as a whole, although the county’s median age remains lower than the state’s median of 38.4 years in 2024. The increasing median age reflects an aging population and has implications for adult care, healthcare, social services, and the workforce.
10.7%
San Joaquin County’s median age increased about 10.7% from 32.7 years in 2010 to 36.2 years in 2024.
Population By Race
As one of our region’s greatest strengths, San Joaquin County’s population is diverse and continues to evolve. Based on the latest available data, the largest racial/ethnic group is Hispanic or Latino (of any race) at approximately 45.6%, followed by White alone at 27.5%, Asian alone at 20.3%, and Black or African American alone at 6.9%. Smaller shares of the population identify as Native Hawaiian and Other Pacific Islander alone (0.7%), American Indian and Alaska Native alone (0.2%), and Some Other Race alone (0.5%).
45.6%
Approximately 45.6% of San Joaquin County’s population identifies as Hispanic or Latino (of any race), the largest racial/ethnic group in the county, based on the most recent demographic estimates
Languages Spoken at Home
San Joaquin County is highly linguistically diverse. As of the most recent estimates, approximately 57% of residents age 5 and over speak only English at home. About 27.1% speak Spanish, 9.2% speak Asian and Pacific Island languages, 5.8% speak other Indo-European languages, and 0.9% speak other languages (U.S. Census Bureau, ACS 1-year estimates, Table C16001; universe is the population age 5 and over).This has important implications for education, public services, and workforce development—especially in upholding the Dymally–Alatorre Bilingual Services Act, which ensures effective communication between California’s government and residents facing language barriers (Gov. Code §7290–7291).
45%
Over 45% of San Joaquin County’s population speaks a language other than English at home.