Census ACS · California
ZIP Code 91331
ZIP code 91331 is located in California with a population of 98,820. The median household income is $82,025 and the median home value is $609,300.
98,820
Population
$82,025
Median Income
$609,300
Median Home Value
34.7
Median Age
Race & Ethnicity
| White | 21.7% |
| Black | 2.1% |
| Asian | 0.0% |
| Hispanic (any race) | 2.5% |
Male: 51.4% · Female: 48.6%
Economy & Income
$82,025
Median Household Income
$24,032
Per Capita Income
13.5%
Poverty Rate
Housing
$609,300
Median Home Value
$1,818
Median Rent
62.8%
Homeownership
Education
58.1%
High School+
11.2%
Bachelor's Degree+
Nearby ZIP Codes
Largest cities in California
Part of California
Metro areas in California
Common questions about ZIP 91331
Frequently Asked Questions
ZIP code 91331 in California has a population of 98,820 according to latest Census ACS data.
The median household income in ZIP 91331 is $82,025. The per capita income is $24,032. The poverty rate is 13.5%.
ZIP code 91331 is located in California.
More from California
Data for ZIP Code Tabulation Area (ZCTA) 91331 from the American Community Survey 5-Year estimates. ZCTAs approximately correspond to USPS ZIP code delivery areas but are built from Census blocks and may not match exactly.
ZIP 91331 stands apart on settlement density — it is among the most densely settled of US ZIP codes, at roughly 10,575 people per square mile. With 98,820 residents, ZIP 91331 is a ZIP code in California.
Median household income is $82,025, near the US median of $78,538. The poverty rate is 13.5%, above the national 12.4%. Housing is expensive: the median home is worth $609,300, with typical rent around $1,818.
Fewer adults hold degrees here than in most comparable places — 11.2%, below the national 35.0%.
That density explains much of the rest of the profile in ZIP 91331: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
Source: U.S. Census Bureau ACS, 2026.