Brazos County is a county in the U.S. state of Texas. As of the 2020 census, its population was 233,849. The county seat is Bryan. Along with Brazoria County, the county is named for the Brazos River, which forms its western border. The county was formed in 1841 and organized in 1843.

Bryan is a city in and the county seat of Brazos County, Texas, United States. It is located in the heart of the Brazos Valley. As of the 2020 census, the city had a population of 83,980. Bryan borders the city of College Station, which lies to its south. Together they make up the Bryan-College Station metropolitan area, the 15th-largest metropolitan area in Texas with 268,248 people as of 2020.