California's 4th Congressional District
California · CA-04
California's 4th Congressional District is one of 52 U.S. House districts in California, represented in Congress by Mike Thompson (Democrat). It is home to roughly 756,454 people, with a median age of 38. The population is about 51% White. The median household income is $93,155, and 33% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted safely Democratic (D+31).
Representative
Current U.S. House member (source: house.gov).
Geography
CA-04 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
By the Polsby-Popper measure, CA-04 is irregular in shape compared with other districts.
Presidential results
Two-party presidential vote by district (source: The Downballot).
Who lives here
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
U.S. Census Bureau, American Community Survey (5-year estimates).