San ygnacio is located in Zapata county Texas with a geographic area of 1.5 square miles. The total population in San ygnacio is 484 with 57.9% male and 42.1% female. Children under age 5 represent 5.4% of the population, under age 18 equal 26.9% of the population and over age 65 is 32.0% of the population. The median household income is $60,653, per capita income is $83,900. There are a total of 187 housing units with 100.0% owner occupied. Education includes 55.6% of residents that are high school graduates and 21.4% with a bachelor's degree or higher. The average temperature in San ygnacio in the summer is 83 degrees, and in the winter 49 degrees.