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California's 4th district

U.S. House district profile: the sitting representative, 2024 Census demographics (119th-district boundaries), partisan lean, and 2026 race rating.

Representative

Official portrait of Mike Thompson

Mike Thompson

CA · District 4
DemocratRanking Member, Tax
Raised $4,204,013 · 185K followers (office + personal) · missed 0.0% of votes
27.7 years in Congress · Up for reelection: 2026
House Committee on Ways and Means · Tax +1 more
View profile

Cook PVI: D+8

District demographics

MeasureValue
Population760,875
Median household income$98,067
Median age39.9
Bachelor's degree or higher37.4%
White alone48.2%
Black alone2.5%
Hispanic or Latino33.9%
Asian alone9.0%
Unemployment rate6.5%
Population density (per sq mi)201

Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates (tables B01003, B01002, B19013 and related), 119th Congress district boundaries, released September 2025; land area from the 2025 Gazetteer.