San Diego County, California
Located in California, San Diego County has a population of 3,288,774 residents and a median age of 37.3 years, making it the #5 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 10.3%. The median home value is $854,700, and the median household income is $106,268, which is 41% above the national median.
Demographics
San Diego County has a population of 3,288,774, making it the #5 most populous county in the US. The median age is 37.3 years, which is 4.1% below the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in San Diego County is $106,268, ranking #117 out of 3,222 counties — 41.4% above the national median. The poverty rate is 10.3% and unemployment stands at 5.8%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in San Diego County is $854,700 (+203.2% vs national). Renters pay a median of $2,246/mo and the homeownership rate is 54.6%.
Median Home Value Trend
Rankings →Household Type
Education
In San Diego County, 43.2% of adults age 25+ hold a bachelor's degree or higher, which is 28.1% above the national average, ranking #197 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in San Diego County is 80.3 years. 16.4% of adults report poor or fair health and 7.3% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
10.2% of adults in San Diego County smoke , 25.4% are obese , and 23.0% report excessive drinking. The drug overdose death rate is 27.7 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in San Diego County is 3.0 per 100,000 and the suicide rate is 11.5 per 100,000. Motor vehicle deaths occur at a rate of 8.5 per 100,000.
Homicide Rate Trend
Families & Children
11.6% of children in San Diego County live in poverty and the infant mortality rate is 3.6 per 1,000 live births. The teen birth rate is 9.4 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in San Diego County is 69.8%. The mean commute time is 28.2 min, which is 2.0% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, San Diego County voted Democratic with a margin of 16.8%. The vote was 56.9% Dem / 40.1% Rep. Compared to 2020, the margin shifted 5.9 toward Republicans .
Vote Share Over Time
About San Diego County, California
San Diego County, California has a total population of 3,288,774, making it the 5th most populous county in the United States. The median age in San Diego County is 37.3 years, which is 4.1% below the national median of 38.9 years.
The median household income in San Diego County is $106,268, which ranks #117 of 3,222 counties nationwide. This is 41.4% above the national median of $75,149. The poverty rate is 10.3%, lower than the national rate of 12.6%. The unemployment rate stands at 5.8%.
The median home value in San Diego County is $854,700, 203.2% above the national median. Renters in San Diego County pay a median gross rent of $2,246 per month. The homeownership rate is 54.6%, compared to the national rate of 64.4%.
In San Diego County, 43.2% of residents aged 25 and older hold a bachelor's degree or higher, 28.1% above the national average of 33.7%. Health insurance coverage stands at 93.6% of the population. The average commute time for workers is 28.2 min.
San Diego County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 42.4% of the population, followed by Hispanic or Latino (34.6%) and Asian (non-Hispanic) (12.1%).
All data for San Diego County, California comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.