Sterling County is a county located on the Edwards Plateau in the U.S. state of Texas. As of the 2020 census, its population was 1,372, making it the ninth-least populous county in Texas. Its county seat is Sterling City. The county is named for W. S. Sterling, an early settler in the area. Sterling County was one of 30 prohibition, or entirely dry, counties in the state of Texas, but is now a moist county.