ZIP code 78155: Seguin, TX
ZIP code 78155 is in Seguin (58% of residents) and Geronimo (2.1%), in Guadalupe County, Texas. 40% of its residents live outside city limits. It is in Texas's 35th congressional district. Its state senate districts are State Senate District 19 (65%), State Senate District 21 (25%) and State Senate District 25 (11%); its state house district is State House District 44.
City and county
| City or town | Share of ZIP residents |
|---|---|
| Seguin | 58% |
| Geronimo | 2.1% |
| New Berlin | 0.9% |
| McQueeney | 0.3% |
| Zuehl | <0.1% |
| County | Share of ZIP residents |
|---|---|
| Guadalupe County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Seguin CCD | 78% |
| Southwest Guadalupe CCD | 11% |
| Southeast Guadalupe CCD | 8.8% |
| Northeast Guadalupe CCD | 2.0% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 35th congressional district (TX-35) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Donna Dodgen | 58% | |
| U.S. Representative (TX-35) | Greg Casar (D) | 202-225-5645 | 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 | 65% |
| State Senator (State Senate District 21) | Judith Zaffirini (Democratic) | 956-722-2293 | 25% |
| State Senator (State Senate District 25) | Donna Campbell (R) | 830-626-0065 | 11% |
| State Representative (State House District 44) | Alan Schoolcraft (R) | 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
- Seguin website: http://www.seguintexas.gov/
- Seguin laws: search for the Seguin, Texas code of ordinances
- Geronimo laws: search for the Geronimo, Texas code of ordinances
- Guadalupe County website: https://www.guadalupetx.gov/
- Guadalupe County laws: search for the Guadalupe County, Texas code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 19 | 65% |
| State Senate District 21 | 25% |
| State Senate District 25 | 11% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 44 | 100% |
Voting precincts
50 voting precincts overlap ZIP 78155. 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:78155")
ZIP 78155 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.