Boundary Atlas

ZIP code 78239: Bexar County, TX

ZIP code 78239 is in San Antonio (19% of residents) and Windcrest (18%), in Bexar County, Texas. 63% of its residents live outside city limits. It is in Texas's 35th congressional district (76%) and Texas's 20th congressional district (24%). Its state senate district is State Senate District 26; its state house district is State House District 120.

31,554residents (2020 Census)
6.4 sq miland area
2cities and towns
2congressional districts
15voting precincts

See it on the mapAll of Texas

City and county

City or townShare of ZIP residents
San Antonio19%
Windcrest18%

CountyShare of ZIP residents
Bexar County100%

Town or county subdivisionShare of ZIP residents
San Antonio Northeast CCD100%

Congressional districts

Congressional districtShare of ZIP residents
Texas's 35th congressional district (TX-35)76%
Texas's 20th congressional district (TX-20)24%

This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.

State legislative districts

State senate districtShare of ZIP residents
State Senate District 26100%

State house districtShare of ZIP residents
State House District 120100%

Voting precincts

15 voting precincts overlap ZIP 78239. Map them, with each precinct's share of the ZIP's residents.

Get this in your AI agent

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:78239")

ZIP 78239 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.