Relampago is a community in Hidalgo County, Texas, home to about 99 people across 1.5 square miles. It has no ZIP code of its own: it’s part of 78570.
Homes sold for a median of $156 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Mercedes; part is in Relampago
Each card is that ZIP code’s whole market, including any part outside Relampago. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Relampago’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | San Antonio International Airport (SAT)236 miles away |
|---|---|
| Closer regional airport | Valley International Airport (HRL)17 miles away |
| Nearest city of 250,000+ | Laredo, TX137 miles away |
| Nearest city of 1 million+ | San Antonio, TX231 miles away |
Straight-line distances from the center of Relampago; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Relampago had 129 residents in the 2020 census, up 24% since 2000.
It’s the 1656th largest of 1,778 towns in Texas by population.
Hidalgo County grew from 6,837 residents in 1900 to 870,781 in 2020.
Hidalgo County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 97°F in summer, and winter lows average 50°F. About 25.8 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Weslaco, TX weather station (4 miles away).
227,682 jobs at 13,393 businesses in Hidalgo County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
69 doctors and other health care providers list an office in Relampago.
Nearest hospitals
Providers with an office here
| Primary care doctors | 7 |
|---|---|
| Specialist doctors | 1 |
| Dentists | 1 |
| Nurse practitioners and physician assistants | 16 |
| Mental health providers | 17 |
| Physical and occupational therapists | 26 |
| Optometrists | 1 |
| Pharmacies | 4 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (3 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Mercedes ISD, South Texas ISD, Weslaco ISD and others. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| John F Kennedy ElMercedes | Pre-K–5 | 399 | Public | 0.2 mi |
| Mercedes Early Literacy ProgramMercedes | Pre-K | 189 | Public | 0.4 mi |
| Ruben Hinojosa ElMercedes | Pre-K–5 | 468 | Public | 1.2 mi |
| Taylor ElMercedes | Pre-K–5 | 406 | Public | 0.6 mi |
| Travis ElMercedes | Pre-K–5 | 478 | Public | 1.1 mi |
| Mercedes DaepMercedes | 2–12 | — | Alternative Education | 1.5 mi |
| Sgt Manuel Chacon MiddleMercedes | 6–9 | 518 | Public | 1.5 mi |
| Sgt William G Harrell MiddleMercedes | 6–8 | 390 | Public | 2.0 mi |
| South Texas ISD Virtual AcademyMercedes | 6–12 | 212 | Public | 1.5 mi |
| Mercedes Academic AcademyMercedes | 9–12 | 100 | Alternative Education | 1.5 mi |
| Mercedes Early College AcademyMercedes | 9–12 | 355 | Alternative Education | 0.4 mi |
| Mercedes H SMercedes | 9–12 | 903 | Public | 1.1 mi |
| South Palm Gardens H SMercedes | 9–12 | 72 | Alternative Education | 2.1 mi |
| South Texas ISD Health ProfessionsMercedes | 9–12 | 781 | Public | 1.3 mi |
| South Texas ISD Science AcademyMercedes | 9–12 | 840 | Public | 1.4 mi |
| Triumph Public High Schools-MercedesMercedes | 9–12 | 109 | Charter, Alternative Education | 0.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Immanuel Lutheran SchoolMercedes | Pre-K–5 | 7 | Lutheran Church–Missouri Synod | 0.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Mercedes, Mila Doce, Indian Hills, Heidelberg and Laguna Seca.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.