Gerrymander Mapgerrymandermap.us

California / CA-10

California District 10

43 Middle of the pack

Less compact than 42% of other congressional districts.

248th least compact of 429 nationally, 49th of 52 in California.

A score describes shape, not intent. Coastlines, rivers and the Voting Rights Act can all make a district irregular. How scores work

The three measures

Polsby-Popper
0.26at least as compact as 55% of districts on this measure

Area compared with perimeter. Low for jagged or snaking edges.

Reock
0.47at least as compact as 47% of districts on this measure

Area compared with the smallest circle around the district, counting only land. Low for stretched shapes.

Convex hull
0.83at least as compact as 70% of districts on this measure

Area compared with a rubber band stretched around the district, counting only land. Low for bites and tentacles.

Each measure runs from 0 to 1, where 1 is a perfect circle or a shape with no dents.

New lines for 2026

California used a different map in the 2026 election than in 2024: the 2025 Proposition 50 map (legislature-drawn; voter-approved). Source: California Secretary of State

Cities and towns

The largest places with people in this district, from the 2020 Census. A place split between districts shows how many of its residents live in this one.

And 29 smaller places. 1% of this district's people live outside any city, town or named community. How places are counted

ZIP codes

42 ZIP codes have residents in this district. 20 of them are split with other districts. A percentage is the share of that ZIP code's 2020 residents who live here.

Show all 42 ZIP codes
  • 94505 (99%)
  • 94506
  • 94507
  • 94509 (1%)
  • 94513 (99%)
  • 94514 (95%)
  • 94516
  • 94517
  • 94518
  • 94519
  • 94520
  • 94521
  • 94523
  • 94525 (62%)
  • 94526
  • 94528
  • 94541 (3%)
  • 94546 (76%)
  • 94548
  • 94549
  • 94551 (1%)
  • 94552 (73%)
  • 94553 (99%)
  • 94556
  • 94561 (55%)
  • 94563 (99%)
  • 94565 (24%)
  • 94568 (1%)
  • 94569
  • 94575
  • 94577 (5%)
  • 94578 (50%)
  • 94580 (26%)
  • 94582
  • 94583
  • 94588 (1%)
  • 94595
  • 94596
  • 94597
  • 94598
  • 94611 (1%)
  • 94619 (1%)

These are the Census Bureau's ZIP code areas, which match residential ZIP codes closely. ZIP codes used only for PO boxes or a single organization aren't included. How ZIP codes are matched

2024 presidential vote

California drew new lines for 2026, and no 2024 results have been published for them. Where the votes come from

U.S. House

Mark DeSaulnier, Democrat

Elected November 3, 2026, takes office January 3, 2027.

Unofficial results from the California Secretary of State, checked November 6, 2026. A race shows a winner once news decision desks have called it. Results become official when the state certifies them. Where this comes from

California's senators

Senators are elected by the whole state, so district lines don't change who they are. Senators serving as of November 6, 2026. Senators elected in November 2026 take office January 3, 2027. Where this comes from

Where it sits in California

The area outlined with dashes on the map, enlarged so its smaller districts can be seen.

San Jose area, enlarged 4 times

Spot a problem with this district? Email us about CA-10.