California's 31st Congressional District
California · CA-31
California's 31st Congressional District is one of 52 U.S. House districts in California, represented in Congress by Gilbert Cisneros (Democrat). It is home to roughly 739,926 people, with a median age of 38.8. The population is about 57% Hispanic. The median household income is $96,791, and 29% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted solidly Democratic (D+17).
Representative
Current U.S. House member (source: house.gov).
Geography
CA-31 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
Covering 170 square miles, CA-31 is the 389th-largest of the 435 congressional districts by land area. With about 4,353 residents per square mile, it is a heavily urban district. Its shape is very irregular: the district's Polsby-Popper score of 0.18 ranks 343rd of 435 nationally, where 1st is the most compact.
Presidential results
In the 2024 presidential election, 57% of CA-31 voters backed Kamala Harris and 40% Donald Trump — a D+17 margin. That is a 14.0-point shift toward the Republicans from 2020, when the district voted D+31.
Two-party presidential vote by district (source: The Downballot).
Who lives here
The median resident of the district is 38.8 years old; 21.4% of residents are under 18 and 15.6% are 65 or older. About 31.1% of residents were born outside the United States, and 54% speak a language other than English at home.
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
At $96,791, the district's median household income ranks 87th of 435 districts nationwide. The typical owner-occupied home is worth $679,337, and the median rent is $1,984 a month. 9.7% of residents live below the poverty line, and workers average a 34.6-minute commute (11.4% work from home).
U.S. Census Bureau, American Community Survey (5-year estimates).