Sonora is a city in and the county seat of Sutton County, Texas, United States. The population was 2,502 at the 2020 census. Sonora is loca…Sonora is a city in and the county seat of Sutton County, Texas, United States. The population was 2,502 at the 2020 census. Sonora is located at 30°34′5″N 100°38′39″W / 30.56806°N 100.64417°W. According to the United States Census Bureau, the city has a total area of 2.0 square miles, all land.