Congressional district · Boundaries of the 116th and 117th Congress

California's 16th district

California's 16th district in the boundaries of the 116th and 117th Congress. Jim Costa (D-CA-16) held the seat last under these boundaries.

These are the boundaries of the 116th and 117th Congress. The newest boundaries of this district are on its main page. See the newest boundaries

Residents
—
Land area
2,842 mi²
Counties
0
Representative
Jim Costa
Open in the Congress explorer
Map of California's 16th district within California

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.

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).

    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.

    Contract money is attributed to districts from the 118th Congress boundaries onward.

    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 6, 2026 · loaded Oct 6, 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.