San isidro is located in Starr county Texas with a geographic area of 3.1 square miles. The total population in San isidro is 103 with 64.1% male and 35.9% female. Children under age 5 represent 0.0% of the population, under age 18 equal 21.4% of the population and over age 65 is 9.7% of the population. The median household income is $20,750, per capita income is $12,454. There are a total of 40 housing units with 92.5% owner occupied. Education includes 10.0% of residents that are high school graduates and 7.5% with a bachelor's degree or higher. The average temperature in San isidro in the summer is 83 degrees, and in the winter 49 degrees.