Watauga is a city in Tarrant County, Texas, United States, and a suburb of Fort Worth. The population was 23,650 at the 2020 census. The city'…Watauga is a city in Tarrant County, Texas, United States, and a suburb of Fort Worth. The population was 23,650 at the 2020 census. The city's businesses and retail markets are generally located on Highway 377.