ZIP code 78570: Mercedes, TX
ZIP code 78570 is in Mercedes (49% of residents), Mila Doce (14%), Indian Hills (8.2%) and Heidelberg (4.8%), in Hidalgo County, Texas. 24% of its residents live outside city limits. It is in Texas's 15th congressional district. Its state senate district is State Senate District 27; its state house districts are State House District 39 (86%) and State House District 35 (14%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| Mercedes | 49% |
| Mila Doce | 14% |
| Indian Hills | 8.2% |
| Heidelberg | 4.8% |
| Laguna Seca | 0.5% |
| Relampago | 0.4% |
| Weslaco | 0.1% |
| County | Share of ZIP residents |
|---|---|
| Hidalgo County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Southeast Hidalgo CCD | 86% |
| Edcouch-Elsa CCD | 14% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Texas's 15th congressional district (TX-15) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Oscar D. Montoya Sr. | 49% | |
| U.S. Representative (TX-15) | Monica De La Cruz (R) | 202-225-9901 | 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 27) | Adam Hinojosa (R) | 956-542-2211 | 100% |
| State Representative (State House District 39) | Mando Martinez (Democratic) | 956-447-9473 | 86% |
| State Representative (State House District 35) | Oscar Longoria (Democratic) | 956-797-2101 | 14% |
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
- Mercedes website: https://www.mercedes-benz.com.vn
- Mercedes laws: search for the Mercedes, Texas code of ordinances
- Mila Doce laws: search for the Mila Doce, Texas code of ordinances
- Indian Hills laws: search for the Indian Hills, 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 27 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 39 | 86% |
| State House District 35 | 14% |
Voting precincts
16 voting precincts overlap ZIP 78570. 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:78570")
ZIP 78570 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.