ZIP code 78933: Austin County, TX
ZIP code 78933 is in Austin County (51%) and Colorado County (49%), Texas, outside any city or Census-designated place. It is in Texas's 27th congressional district. Its state senate districts are State Senate District 18 (51%) and State Senate District 17 (49%); its state house district is State House District 85.
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Austin County | 51% |
| Colorado County | 49% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Columbus CCD | 39% |
| Sealy CCD | 30% |
| Industry CCD | 21% |
| Eagle Lake CCD | 10% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 27th congressional district (TX-27) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (TX-27) | Michael Cloud (R) | 202-225-7742 | 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 18) | Lois Kolkhorst (R) | 361-573-7300 | 51% |
| State Senator (State Senate District 17) | Joan Huffman (R) | 281-497-2450 | 49% |
| State Representative (State House District 85) | Stan Kitzman (R) | 979-865-4560 | 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
- Austin County website: https://www.austincounty.com/
- Austin County laws: search for the Austin County, Texas code of ordinances
- Colorado County website: https://www.co.colorado.tx.us/
- Colorado County laws: search for the Colorado County, Texas code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 18 | 51% |
| State Senate District 17 | 49% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 85 | 100% |
Voting precincts
7 voting precincts overlap ZIP 78933. 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:78933")
ZIP 78933 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.