119th Congress · CA-31
California's 31st Congressional District
California's 31st Congressional District (CA-31) has a population of 741,057. The median household income is $90,026 and the median age is 38.9.
741,057
Population
3568
People / sq mi
$90,026
Median Income
38.9
Median Age
CA-31 covers 208 sq mi of land at 3568.4 people per square mile.
Race & Ethnicity
| White | 27.4% |
| Black or African American | 2.7% |
| Asian | 0.1% |
| Hispanic or Latino (any race) | 3.8% |
Economy & Income
$90,026
Median Household Income
$34,240
Per Capita Income
8.6%
Poverty Rate
3.9%
Unemployment
Housing
$660,600
Median Home Value
$1,905
Median Rent
59.3%
Homeownership
Education
78.4%
High School+
25.0%
Bachelor's+
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Frequently Asked Questions
California's 31st Congressional District (CA-31) has a population of 741,057 according to the latest Census ACS 5-Year estimates. Each US Congressional District is drawn to be roughly equal in population (~760K people).
The median household income in California's 31st Congressional District is $90,026, with a per capita income of $34,240.
California's 31st Congressional District is 27.4% White, 2.7% Black, 0.1% Asian, and 3.8% Hispanic or Latino, per Census ACS data.
More from California
Data for California's 31st Congressional District (119th Congress) from the American Community Survey 5-Year estimates. Land area from the Census Gazetteer files. Congressional districts are redrawn after each decennial Census; the 119th Congress (current) uses post-2020 boundaries.
The this entity record above pulls directly from the U.S. Census Bureau ACS and decennial files. What follows is the per-entity context — how this entity sits in the broader U.S. population demographics distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the the U.S. Census Bureau ACS and decennial files portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. states, metros, cities, and ZIPs. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: U.S. Census Bureau ACS, 2026.