ZIP code 78140: Nixon, TX
ZIP code 78140 is in Nixon (65% of residents), in Gonzales County (88%), Wilson County (7.9%), Guadalupe County (3.6%) and Karnes County (0.4%), Texas. 35% of its residents live outside city limits. It is in Texas's 15th congressional district (88%) and Texas's 35th congressional district (12%). Its state senate districts are State Senate District 18 (88%) and State Senate District 21 (12%); its state house districts are State House District 44 (92%) and State House District 31 (8.3%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| Nixon | 65% |
| County | Share of ZIP residents |
|---|---|
| Gonzales County | 88% |
| Wilson County | 7.9% |
| Guadalupe County | 3.6% |
| Karnes County | 0.4% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Nixon CCD | 86% |
| Stockdale CCD | 7.9% |
| Southeast Guadalupe CCD | 3.6% |
| Smiley CCD | 2.1% |
| Gillett CCD | 0.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 15th congressional district (TX-15) | 88% |
| Texas's 35th congressional district (TX-35) | 12% |
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 |
|---|---|---|---|
| U.S. Representative (TX-15) | Monica De La Cruz (R) | 202-225-9901 | 88% |
| U.S. Representative (TX-35) | Greg Casar (D) | 202-225-5645 | 12% |
| 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 18) | Lois Kolkhorst (R) | 361-573-7300 | 88% |
| State Senator (State Senate District 21) | Judith Zaffirini (Democratic) | 956-722-2293 | 12% |
| State Representative (State House District 44) | Alan Schoolcraft (R) | 92% | |
| State Representative (State House District 31) | Ryan Guillen (R) | 8.3% |
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).
Local government
- Nixon laws: search for the Nixon, Texas code of ordinances
- Gonzales County website: https://www.co.gonzales.tx.us/
- Gonzales County laws: search for the Gonzales County, Texas code of ordinances
- Wilson County website: https://www.co.wilson.tx.us/
- Wilson County laws: search for the Wilson County, Texas code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 18 | 88% |
| State Senate District 21 | 12% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 44 | 92% |
| State House District 31 | 8.3% |
Voting precincts
8 voting precincts overlap ZIP 78140. 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:78140")
ZIP 78140 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.