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California / CA-12

California District 12

21 Compact

Less compact than 15% of other congressional districts.

364th least compact of 429 nationally, 52nd 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
0.28at least as compact as 60% of districts on this measure

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

Reock
0.60at least as compact as 80% of districts on this measure

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

Convex hull
0.93at least as compact as 96% 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.

The state's edge

51% of this district's border is the state's edge: a coastline, a national border or a state line. Mapmakers don't choose those lines. A ragged one, like a coastline or a river, lowers Polsby-Popper. Reock and convex hull count only the state's own land, so water and neighboring states don't count against them. More on the state's edge

Who lives here

Most of this district's voting-age residents (64.8%) belong to minority groups. The largest are Asian (24.1%), Hispanic or Latino (21.2%) and Black (17.2%). The Voting Rights Act can require districts that keep a minority community together so it can elect candidates it prefers, and those districts can be irregular on purpose. A district like this isn't necessarily drawn for that reason, and the site doesn't know whether this one was. Figures are from the 2020 Census. How these are counted

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.

How places are counted

ZIP codes

30 ZIP codes have residents in this district. 8 of them are split with other districts. A percentage is the share of that ZIP code's 2020 residents who live here.

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

Lateefah Simon, 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

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