ZIP code 78203: San Antonio, TX
ZIP code 78203 is in San Antonio, in Bexar County, Texas. It is in Texas's 20th congressional district. Its state senate districts are State Senate District 19 (66%) and State Senate District 26 (34%); its state house districts are State House District 120 (66%), State House District 119 (23%) and State House District 123 (10%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| San Antonio | 100% |
| County | Share of ZIP residents |
|---|---|
| Bexar County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| San Antonio Central CCD | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 20th congressional district (TX-20) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Gina Ortiz Jones | 100% | |
| U.S. Representative (TX-20) | Joaquin Castro (D) | 202-225-3236 | 100% |
| 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 19) | Roland Gutierrez (Democratic) | 830-278-1234 | 66% |
| State Senator (State Senate District 26) | José Menéndez (Democratic) | 210-733-6604 | 34% |
| State Representative (State House District 120) | Barbara Gervin-Hawkins (Democratic) | 210-822-2534 | 66% |
| State Representative (State House District 119) | Liz Campos (Democratic) | 210-806-0899 | 23% |
| State Representative (State House District 123) | Diego Bernal (Democratic) | 210-308-9700 | 10% |
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
- 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 19 | 66% |
| State Senate District 26 | 34% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 120 | 66% |
| State House District 119 | 23% |
| State House District 123 | 10% |
Voting precincts
5 voting precincts overlap ZIP 78203. 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:78203")
ZIP 78203 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.