Brazoria County is a county in the U.S. state of Texas. As of the 2020 census, the population of the county was 372,031. The county seat is Angleton.

Angleton is a city in and the county seat of Brazoria County, Texas, United States, within the Houston–The Woodlands–Sugar Land metropolitan area. Angleton lies at the intersection of State Highway 288, State Highway 35, and the Union Pacific Railroad. The population was 19,429 at the 2020 census. Angleton is in the 14th congressional district, and is represented by Republican Congressman Randy Weber.