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–Not graded
History · San Isidro

San Isidro’s post office opened in 1904

Most of San Isidro was built recently: 0.0% of its homes predate 1940 and the median home dates from 1977. Below: maps from 1939 on and the census since 2000.

1904first post office
0on the National Register
0.0%homes built before 1940
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Quick answers

How San Isidro began

When was San Isidro founded?

1904

The San Isidro post office opened in 1904, the earliest record of the town by name.

First census: 270 in 20002020 census: 187122 years
Founding year: the first San Isidro post office (Blevins & Helbock, CC0).

What stands out about San Isidro’s past

Read from the archive, the National Register and the record. The page puts what stands out first.

A history waiting to be writtenNo old photos of San Isidro are in the public archives yet. The rest are in attics and albums.
★ What stands out · Help out

Start San Isidro’s collection

The first neighbors to add old photos shape how San Isidro’s history is told.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
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The story so far

San Isidro, in brief

Wikipedia doesn’t have a history of San Isidro yet. The photos, dates and memories neighbors add here are how it gets written.

San Isidro is a census-designated place (CDP) in Starr County, Texas, United States. As of the 2020 census, San Isidro had a population of 187. The town is named for St. Isidore the Laborer, the patron saint of farmers. A large Southwestern Barrel Cactus growing just east of town is said to be the largest in Texas.

Its first post office opened in 1904. Between the 2010 and 2020 censuses its population fell from 240 to 187 (-22%).

Intro from Wikipedia. Population: U.S. Census Bureau.

By decade

No old photos in the archives yet

Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.

Be the first to add onePhotograph a print flat, in daylight, no flash.
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On the map

San Isidro on the map, 1939 to 1972

Every edition of the U.S. Geological Survey’s map of San Isidro. Tap a year, or press play to watch the town change.

San Isidro on the 1939 USGS mapSan Isidro on the 1972 USGS map1939La Reforma sheet · 1:62,500

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of San Isidro.

People over time

San Isidro, census by census

010020030020002020Peak: 270

Between 187 and 270 people in every census since 2000.

3 censuses, 2000–2020.

U.S. Census Bureau decennial counts, from the census table on San Isidro’s Wikipedia page.

Places that used to be

Old corners

San Isidro’s post office has been open since 1904.

Hamlets and corners on the map
Gloria Colonia

US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).

Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

DelmitaIts storynot graded: under 1,000 residents or part of its town

Questions about San Isidro’s history

What year was San Isidro founded?

The San Isidro post office opened in 1904, the earliest record of the town by name (U.S. post office records).

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
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Sources

Where this page comes from

Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →

From U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.