ZIP code 78573: Alton, TX
ZIP code 78573 is in Alton (43% of residents), Mission (21%), Palmhurst (6.2%), West Sharyland (4.8%) and McAllen (1.3%), in Hidalgo County, Texas. 24% of its residents live outside city limits. It is in Texas's 28th congressional district (100%) and Texas's 15th congressional district (0.5%). Its state senate district is State Senate District 20; its state house districts are State House District 36 (62%), State House District 35 (34%), State House District 41 (3.8%) and State House District 40 (0.5%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| Alton | 43% |
| Mission | 21% |
| Palmhurst | 6.2% |
| West Sharyland | 4.8% |
| McAllen | 1.3% |
| County | Share of ZIP residents |
|---|---|
| Hidalgo County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Mission CCD | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 28th congressional district (TX-28) | 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 |
|---|---|---|---|
| Mayor | Norie Gonzalez Garza | 21% | |
| U.S. Representative (TX-28) | Henry Cuellar (D) | 202-225-1640 | 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 20) | Chuy Hinojosa (Democratic) | 361-882-0900 | 100% |
| State Representative (State House District 36) | Sergio Muñoz (Democratic) | 956-584-8999 | 62% |
| State Representative (State House District 35) | Oscar Longoria (Democratic) | 956-797-2101 | 34% |
| State Representative (State House District 41) | Bobby Guerra (Democratic) | 956-292-0407 | 3.8% |
| State Representative (State House District 40) | Terry Canales (Democratic) | 956-383-0860 | 0.5% |
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
- Alton website: http://www.alton-tx.gov/
- Alton laws: search for the Alton, Texas code of ordinances
- Mission website: https://missiontexas.us/
- Mission laws: search for the Mission, Texas code of ordinances
- Palmhurst website: http://cityofpalmhursttx.com/
- Palmhurst laws: search for the Palmhurst, Texas code of ordinances
- Hidalgo County website: https://www.hidalgocounty.us/
- Hidalgo County laws: search for the Hidalgo County, Texas code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 20 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 36 | 62% |
| State House District 35 | 34% |
| State House District 41 | 3.8% |
| State House District 40 | 0.5% |
Voting precincts
24 voting precincts overlap ZIP 78573. 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:78573")
ZIP 78573 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.