| Official Name: | San Isidro, Texas |
| Settlement Type: | CDP |
| Mapsize: | 250px |
| Image Map1: | Starr County SanIsidro.svg |
| Mapsize1: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Texas |
| Subdivision Type2: | County |
| Subdivision Name2: | Starr |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 3.1 |
| Area Land Sq Mi: | 3.1 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2020 |
| Population Total: | 187 |
| Population Density Km2: | auto |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 86 |
| Elevation Ft: | 282 |
| Coordinates: | 26.7189°N -98.4442°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 78588, 78536 |
| Area Code: | 956 |
| Blank Name: | FIPS code |
| Blank Info: | 48-65432[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1346363[2] |
San Isidro is a census-designated place (CDP) in Starr County, Texas, United States. The population was 240 at the 2010 census. 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.
San Isidro is located at 26.7189°N -98.4442°W (26.718830, -98.444126).[3]
The CDP lost a little area prior to the 2010 census, making the total area of 3.1 square miles (8.0 km), all land.[4] [5]
San Isidro was first listed as a census designated place in the 2000 U.S. Census.
| White alone (NH) | 4 | 22 | style='background: #ffffe6; | 10 | 1.48% | 9.17% | style='background: #ffffe6; | 5.35% | |
| Black or African American alone (NH) | 0 | 0 | style='background: #ffffe6; | 0 | 0.00% | 0.00% | style='background: #ffffe6; | 0.00% | |
| Native American or Alaska Native alone (NH) | 0 | 0 | style='background: #ffffe6; | 0 | 0.00% | 0.00% | style='background: #ffffe6; | 0.00% | |
| Asian alone (NH) | 0 | 0 | style='background: #ffffe6; | 0 | 0.00% | 0.00% | style='background: #ffffe6; | 0.00% | |
| Pacific Islander alone (NH) | 0 | 0 | style='background: #ffffe6; | 0 | 0.00% | 0.00% | style='background: #ffffe6; | 0.00% | |
| Some Other Race alone (NH) | 0 | 0 | style='background: #ffffe6; | 0 | 0.00% | 0.00% | style='background: #ffffe6; | 0.00% | |
| Mixed race or Multiracial (NH) | 0 | 0 | style='background: #ffffe6; | 1 | 0.00% | 0.00% | style='background: #ffffe6; | 0.53% | |
| Hispanic or Latino (any race) | 266 | 218 | style='background: #ffffe6; | 176 | 98.52% | 90.83% | style='background: #ffffe6; | 94.12% | |
| Total | 270 | 240 | style='background: #ffffe6; | 187 | 100.00% | 100.00% | style='background: #ffffe6; | 100.00% |
As of the 2020 United States census, there were 187 people, 40 households, and 28 families residing in the CDP.
At the 2000 census there were 270 people, 94 households, and 70 families in the CDP. The population density was 82.9sp=usNaNsp=us. There were 113 housing units at an average density of 34.7sp=usNaNsp=us. The racial makeup of the CDP was 95.19% White, 3.33% from other races, and 1.48% from two or more races. 98.52% of the population were Hispanic or Latino of any race.Of the 94 households 39.4% had children under the age of 18 living with them, 61.7% were married couples living together, 10.6% had a female householder with no husband present, and 25.5% were non-families. 24.5% of households were one person and 14.9% were one person aged 65 or older. The average household size was 2.87 and the average family size was 3.49.
The age distribution was 32.6% under the age of 18, 5.6% from 18 to 24, 24.8% from 25 to 44, 22.6% from 45 to 64, and 14.4% 65 or older. The median age was 36 years. For every 100 females, there were 110.9 males. For every 100 females age 18 and over, there were 95.7 males.
The median household income was $18,750 and the median family income was $20,313. Males had a median income of $15,625 versus $33,333 for females. The per capita income for the CDP was $8,965. 42.3% of the population and 35.9% of families were below the poverty line. Out of the total population, 57.6% of those under the age of 18 and 7.1% of those 65 and older were living below the poverty line.
San Isidro is served by the San Isidro Independent School District and is home to the San Isidro High School Tigers.