ZIP code 78557: Hidalgo, TX
ZIP code 78557 is in Hidalgo, in Hidalgo County, Texas. It is in Texas's 15th congressional district (100%) and Texas's 28th congressional district (<0.1%). Its state senate district is State Senate District 20; its state house district is State House District 36.
City and county
| City or town | Share of ZIP residents |
|---|---|
| Hidalgo | 100% |
| McAllen | <0.1% |
| County | Share of ZIP residents |
|---|---|
| Hidalgo County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| McAllen-Pharr CCD | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 15th congressional district (TX-15) | 100% |
| Texas's 28th congressional district (TX-28) | <0.1% |
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 | 100% |
| U.S. Representative (TX-28) | Henry Cuellar (D) | 202-225-1640 | <0.1% |
| 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 | 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
- Hidalgo website: https://cityofhidalgo.net/
- Hidalgo laws: search for the Hidalgo, 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 | 100% |
Voting precincts
5 voting precincts overlap ZIP 78557. 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:78557")
ZIP 78557 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.