California District 4
Congressional District in CA • 5 Counties
California's 4th congressional district is represented by Mike Thompson, a Democratic U.S. representative. Thompson won the 2024 general election with 66.5% of the vote.
2026 election
FEC filings for the 2026 election. Filing is not ballot access — certified ballots are set by each state.
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District Boundaries
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Demographic data not available for this district
Census API data is currently unavailable
Age Distribution
Data unavailable
Census ACS age data not returned
Median age: 0.0 years
Household Income Distribution
Data unavailable
Census ACS income data not returned
Median household income: $0
Racial & Ethnic Composition
2024 Election Results
Mike Thompson won by 32.9%
342,680 total votes cast
Employment by Occupation
Data unavailable
Census ACS occupation data not returned
Federal Spending
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Relevant Legislation
Quick Facts
Representative
Mike ThompsonMajor Counties
Major Cities
Neighboring Districts
Sources and method
· congress-legislators, Census ACS, MEDSL, TIGERweb, Gazetteer, FEC, and 6 more · ACS 2020–2024 5-year estimates
- congress-legislators@unitedstates projectCurrent representative
- American Community SurveyU.S. Census BureauPopulation, income, age and other demographicsACS 2020–2024 5-year estimates · Loaded Oct 27, 2026, 12:16 AM ET
- MEDSL U.S. House 1976–2024MIT Election Data and Science LabLast House election result2024 general election
- TIGERweb district boundariesU.S. Census BureauDistrict map119th Congress boundaries
- Census GazetteerU.S. Census BureauLand area and neighboring districts2024 Gazetteer, 119th Congress districts
- FEC filingsFederal Election Commission2026 candidates and campaign finance
- FREDFederal Reserve Bank of St. Louis (BLS and BEA series)Statewide economic indicators
- Federal agency datasetsEPA ECHO, CMS Hospital Compare, FEMA, CFPB, EIA, College Scorecard, NIH, FDIC BankFindCommunity profile section
- HUD Fair Market Rents and Income LimitsU.S. Department of Housing and Urban DevelopmentHousing affordability section
- Schools, local finance and health dataNCES Common Core of Data, Census ASFIN, CDC PLACESServices and health section
- USAspending.govU.S. Department of the TreasuryFederal spending and relevant bills
- Congress.govLibrary of CongressBills relevant to this district
congress-legislators, MEDSL: CC0 1.0 (public domain dedication) · All other sources: Public domain (17 U.S.C. § 105) · Method: Data sources → · Campaign finance →
The spending narrative is written by AI from USAspending.gov data and is labeled where it appears. It is not a source itself. How we analyze data →
Dates shown where the source reports one. “Loaded” is when CIV.IQ last fetched the record.
Frequently Asked Questions
- Who represents California District 4?
- Mike Thompson (Democrat) currently represents California District 4 in the U.S. House of Representatives.
- What counties are in California District 4?
- California District 4 includes 5 counties: Lake, Napa, Yolo, Solano, Sonoma.
- What are the major cities in California District 4?
- The major cities in this district include Santa Rosa, Vacaville, Napa.