San Marcos, Texas
San Marcos is a city in Hays County, Texas, with 68,049 residents in 2020. It spans 2 congressional districts: TX-21 (89%) and TX-27 (11%). Its state senate district is State Senate District 21; its state house district is State House District 45.
County
| County | Share of residents |
|---|---|
| Hays County | 100% |
Congressional districts
| Congressional district | Share of residents |
|---|---|
| Texas's 21st congressional district (TX-21) | 89% |
| Texas's 27th congressional district (TX-27) | 11% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Jane Hughson | citywide | |
| U.S. Representative (TX-21) | Chip Roy (R) | 202-225-4236 | 89% |
| U.S. Representative (TX-27) | Michael Cloud (R) | 202-225-7742 | 11% |
| 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 21) | Judith Zaffirini (Democratic) | 956-722-2293 | 100% |
| State Representative (State House District 45) | Erin Zwiener (Democratic) | 100% |
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 Marcos website: https://www.sanmarcostx.gov/
- San Marcos laws: search for the San Marcos, Texas code of ordinances
- Hays County website: https://www.hayscountytx.gov/
- Hays County laws: search for the Hays County, Texas code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 21 | 100% |
| State house district | Share of residents |
|---|---|
| State House District 45 | 100% |
ZIP codes
Percentages mark ZIPs only partly in San Marcos: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get San Marcos's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:4865600")
San Marcos here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.