Southlake is an affluent city located predominately in Tarrant County with areas that extend into Denton County in the U.S. state of Texas that is part of the Dallas - Fort Worth metroplex. As of the 2010 census it had a population of 26,575. Southlake is known for public schools, Southlake Town Square, its wealth, Gateway Church and Carroll High School's 8-time state champion football team.