ZIP code 78638: Guadalupe County, TX
ZIP code 78638 is in Kingsbury (5.5% of residents), in Guadalupe County (100%) and Gonzales County (0.5%), Texas. 94% of its residents live outside city limits. It is in Texas's 35th congressional district (100%) and Texas's 15th congressional district (0.5%). Its state senate districts are State Senate District 21 (100%) and State Senate District 18 (0.5%); its state house district is State House District 44.
City and county
| City or town | Share of ZIP residents |
|---|---|
| Kingsbury | 5.5% |
| Staples | 0.8% |
| County | Share of ZIP residents |
|---|---|
| Guadalupe County | 100% |
| Gonzales County | 0.5% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Northeast Guadalupe CCD | 98% |
| Seguin CCD | 1.6% |
| Harwood-Ottine CCD | 0.5% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 35th congressional district (TX-35) | 100% |
| Texas's 15th congressional district (TX-15) | 0.5% |
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 | 100% |
| U.S. Representative (TX-15) | Monica De La Cruz (R) | 202-225-9901 | 0.5% |
| 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 Senator (State Senate District 18) | Lois Kolkhorst (R) | 361-573-7300 | 0.5% |
| State Representative (State House District 44) | Alan Schoolcraft (R) | 100% |
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
- Kingsbury laws: search for the Kingsbury, Texas code of ordinances
- Guadalupe County website: https://www.guadalupetx.gov/
- Guadalupe County laws: search for the Guadalupe County, 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
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 21 | 100% |
| State Senate District 18 | 0.5% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 44 | 100% |
Voting precincts
5 voting precincts overlap ZIP 78638. 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://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:78638")
ZIP 78638 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.