There are 7 US Post Offices in Brazos County serving a total of 101,872 residents equating to 14,553 residents per post office. It's estimated that approximately 162,599 packages are handled across the 7 county post offices annually. Brazos County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 194,851. 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. Brazos County is part of the College Station-Bryan, TX Metropolitan Statistical Area."