San Isidro is a community in Starr County, Texas, home to about 214 people across 3.1 square miles. Its ZIP code is 78588, and parts of 78536 are in San Isidro too.
Mostly San Isidro
Mostly Delmita; part is in San Isidro
We’re writing up San Isidro’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows San Isidro well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | San Antonio International Airport (SAT)196 miles away |
|---|---|
| Closer regional airport | McAllen Miller International Airport (MFE)38 miles away |
| Nearest city of 250,000+ | Laredo, TX88 miles away |
| Nearest city of 1 million+ | San Antonio, TX191 miles away |
Straight-line distances from the center of San Isidro; 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.
San Isidro had 187 residents in the 2020 census, down 31% since 2000.
It’s the 1530th largest of 1,778 towns in Texas by population.
Starr County grew from 11,469 residents in 1900 to 65,920 in 2020.
Starr County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 98°F in summer, and winter lows average 47°F. About 19.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Mccook, TX weather station (21 miles away).
8,704 jobs at 594 businesses in Starr County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Public schools here are run by San Isidro ISD. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| San Isidro ElSan Isidro | Pre-K–8 | 91 | Public | 2.0 mi |
| San Isidro H SSan Isidro | 9–12 | 62 | Public | 2.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Delmita.
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.