About This Place
San Diego is a city in Duval and Jim Wells counties in the U.S. state of Texas. The population was 4,488 at the 2010 census. It is located primarily in Duval County, of which it is the county seat.
San Diego is located at 27°45′45″N 98°14′20″W / 27.762559°N 98.238771°W / 27.762559; -98.238771 (27.762559, -98.238771).
According to the United States Census Bureau, the city has a total area of 1.6 square miles (4.2 km2), all of it land.