Congressional district · Boundaries of the 119th Congress
California's 4th district
California's 4th district has 746,149 residents on 3,780 mi² of land. It is represented by Mike Thompson (D-CA-4). Federal contract obligations attributed to it reached $61.5M in FY2026.
- Residents
- 746,149
- Land area
- 3,780 mi²
- Counties
- 5
- Representative
- Mike Thompson
Members for this district
Members who held this seat while these boundaries were in force, newest first.
Senators
The state's senators today, or on the last day of these boundaries for an older plan.
Adam B. SchiffD-CA
Alex PadillaD-CA
Counties
Share of the district's residents living in each county, and share of the county's residents living in the district (2020 census tracts weighted by their overlap).
- Sonoma County33% of the district · 51% of the county
- Yolo County22% of the district · 76% of the county
- Napa County18% of the district · 100% of the county
- Solano County17% of the district · 29% of the county
- Lake County9.1% of the district · 100% of the county
Federal contracts
Contract obligations attributed to the district by each action's county and its award's ZIP code (land shares through census tracts); an estimate where ZIP codes cross district lines.
- Obligations · FY2026
- $61.5M
- Per resident
- $82.44
- Rank in California
- 52 of 52
- Contract actions
- 1,645
- New awards: 1,071
By fiscal year
- 1.5BFY2017
- 1.5BFY2018
- 1.5BFY2019
- 242.5MFY2020
- 136.3MFY2021
- 160.1MFY2022
- 210.2MFY2023
- 114.7MFY2024
- 76.7MFY2025
- 61.5MFY2026
Top buyers
- Department of the Navy$10.8M18%Department of Defense
- Department of the Army$9.8M16%Department of Defense
- Department of Veterans Affairs$7.2M12%
- U.S. Coast Guard$7M11%Department of Homeland Security
- National Park Service$2.2M3.6%Department of the Interior
- Agricultural Marketing Service$1.8M2.9%Department of Agriculture
- Departmental Offices$1.7M2.8%Department of the Interior
Top recipients
- HGL-PORTAGE JV LLC$8.5M14%1 award
- GRANITE CONSTRUCTION COMPANY$7.1M11%1 award
- UNIVERSITY OF CALIFORNIA, DAVIS$6.1M9.9%31 awards
- MICROWAVE POWER PRODUCTS, INC.$4.2M6.8%4 awards
- DIAL GENERAL ENGINEERING$3.1M5.1%6 awards
- 11 awards
- MELLINGER ENGINEERING, INCORPORATED$2.3M3.7%8 awards
- TRINITY NORTH STAR JV$2.1M3.4%2 awards
- ELVE INC$1.7M2.7%2 awards
- MARIANI PACKING CO., INC.$1.6M2.6%3 awards
Other boundaries
District lines change between plans; each plan keeps its own page.
Sources and method
Every figure on this page traces to these records.
- Congressional district boundaries and relationship files (U.S. Census Bureau)U.S. Census Bureau, Cartographic Boundary Files (congressional districts) and 2020 relationship files · release cd116+cd118+cd119 · loaded Oct 3, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
- Members of Congress, their terms, committees and identifiers (The @unitedstates project (from the Biographical Directory of the U.S. Congress, the House and the Senate))unitedstates/congress-legislators: legislators, committees and current committee membership · data current to Oct 3, 2026 · loaded Oct 3, 2026 · license: CC0 1.0 (public domain dedication)
- ZIP code (ZCTA) to congressional district crosswalk (U.S. Census Bureau)U.S. Census Bureau, 2020 relationship files (ZCTAs, tracts and congressional districts); shares computed by Analisa · release 2020 · loaded Oct 3, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
- Federal contract transactions (Federal Procurement Data System) (U.S. Department of the Treasury, USAspending.gov)USAspending.gov, prime award contract transactions (FPDS) · data current to Oct 3, 2026 · loaded Oct 3, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
- Money and votes are shown side by side; neither explains the other.