Boundary Atlas

ZIP code 78071: Three Rivers, TX

ZIP code 78071 is in Three Rivers (36% of residents), in Live Oak County (100%) and McMullen County (0.2%), Texas. 64% of its residents live outside city limits. It is in Texas's 28th congressional district. Its state senate district is State Senate District 21; its state house district is State House District 31.

4,124residents (2020 Census)
313.9 sq miland area
1cities and towns
1congressional district
11voting precincts

See it on the mapAll of Texas

City and county

City or townShare of ZIP residents
Three Rivers36%

CountyShare of ZIP residents
Live Oak County100%
McMullen County0.2%

Town or county subdivisionShare of ZIP residents
Three Rivers CCD100%
Tilden CCD0.2%

Congressional district

Congressional districtShare of ZIP residents
Texas's 28th congressional district (TX-28)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 21100%

State house districtShare of ZIP residents
State House District 31100%

Voting precincts

11 voting precincts overlap ZIP 78071. Map them, with each precinct's share of the ZIP's residents.

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Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:zcta:78071")

ZIP 78071 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.