ZIP code 78231: San Antonio, TX
ZIP code 78231 is in San Antonio (76% of residents) and Shavano Park (24%), in Bexar County, Texas. It is in Texas's 23rd congressional district (86%) and Texas's 21st congressional district (14%). Its state senate districts are State Senate District 26 (76%) and State Senate District 25 (24%); its state house districts are State House District 122 (53%) and State House District 123 (47%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| San Antonio | 76% |
| Shavano Park | 24% |
| County | Share of ZIP residents |
|---|---|
| Bexar County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| San Antonio North CCD | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 23rd congressional district (TX-23) | 86% |
| Texas's 21st congressional district (TX-21) | 14% |
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.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Gina Ortiz Jones | 76% | |
| U.S. Representative (TX-21) | Chip Roy (R) | 202-225-4236 | 14% |
| U.S. Senator | John Cornyn (R) | 202-224-2934 · contact form | statewide |
| U.S. Senator | Ted Cruz (R) | 202-224-5922 · contact form | statewide |
| State Senator (State Senate District 26) | José Menéndez (Democratic) | 210-733-6604 | 76% |
| State Senator (State Senate District 25) | Donna Campbell (R) | 830-626-0065 | 24% |
| State Representative (State House District 122) | Mark Dorazio (R) | 53% | |
| State Representative (State House District 123) | Diego Bernal (Democratic) | 210-308-9700 | 47% |
| U.S. Representative (TX-23) | Vacant |
From Wikidata (community-maintained); confirm on the city's website.
Elected in 2024 under TX's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0); Mayors: Wikidata (CC0).
Local government
- San Antonio website: https://www.sa.gov/
- San Antonio council: San Antonio City Council
- San Antonio laws: search for the San Antonio, Texas code of ordinances
- Shavano Park website: https://www.shavanopark.org/
- Shavano Park laws: search for the Shavano Park, Texas code of ordinances
- Bexar County website: https://bexar.gov
- Bexar County laws: search for the Bexar County, Texas code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 26 | 76% |
| State Senate District 25 | 24% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 122 | 53% |
| State House District 123 | 47% |
Voting precincts
11 voting precincts overlap ZIP 78231. 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:78231")
ZIP 78231 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.