ZIP code 78118: Karnes City, TX
ZIP code 78118 is in Karnes City (72% of residents), in Karnes County (99%), Atascosa County (0.8%) and Live Oak County (0.2%), Texas. 28% of its residents live outside city limits. It is in Texas's 35th congressional district (99%) and Texas's 28th congressional district (1.0%). Its state senate districts are State Senate District 21 (99%) and State Senate District 19 (0.8%); its state house districts are State House District 31 (99%) and State House District 80 (0.8%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| Karnes City | 72% |
| County | Share of ZIP residents |
|---|---|
| Karnes County | 99% |
| Atascosa County | 0.8% |
| Live Oak County | 0.2% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Karnes City CCD | 94% |
| Gillett CCD | 2.4% |
| Runge CCD | 1.4% |
| Kenedy CCD | 1.0% |
| Campbellton CCD | 0.8% |
| Three Rivers CCD | 0.2% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 35th congressional district (TX-35) | 99% |
| Texas's 28th congressional district (TX-28) | 1.0% |
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-35) | Greg Casar (D) | 202-225-5645 | 99% |
| U.S. Representative (TX-28) | Henry Cuellar (D) | 202-225-1640 | 1.0% |
| 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 | 99% |
| State Senator (State Senate District 19) | Roland Gutierrez (Democratic) | 830-278-1234 | 0.8% |
| State Representative (State House District 31) | Ryan Guillen (R) | 99% | |
| State Representative (State House District 80) | Don McLaughlin (R) | 0.8% |
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
- Karnes City website: https://cityofkctx.com
- Karnes City laws: search for the Karnes City, Texas code of ordinances
- Karnes County website: https://www.co.karnes.tx.us/
- Karnes County laws: search for the Karnes County, Texas code of ordinances
- Atascosa County website: https://co.atascosa.tx.us/
- Atascosa County laws: search for the Atascosa County, Texas code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 21 | 99% |
| State Senate District 19 | 0.8% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 31 | 99% |
| State House District 80 | 0.8% |
Voting precincts
9 voting precincts overlap ZIP 78118. 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:78118")
ZIP 78118 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.