[4][5] Brazos County is part of the Bryan-College Station Metropolitan Statistical Area, which consists of Bryan, College Station, and smaller cities and towns in Brazos, Burleson, and Robertson counties.

The first court, with Judge R. E. B. Baylor presiding, was held later that year in the home of Joseph Ferguson, fourteen miles west of the site of present Bryan.

The county seat, named Boonville for Mordecai Boon, was located on John Austin's league and was surveyed by Hiram Hanover in 1841.

After the Civil War tens of thousands of new residents moved to Brazos County, attracted by its good lands, with plenty of timber and a patchwork of prairies and fertile floodplains.

As newcomers poured in by the thousands the county suffered from arson, feuding, shooting and racial violence, including mob lynchings.

The Brazos Transit District operates a fixed route bus service and paratransit throughout Bryan and College Station.

Unlike most counties that are home to a large university, Brazos County is a Republican stronghold, perhaps reflecting the political views of influential Texas A&M alumni and families of the student body.

No Democratic presidential nominee has carried it since Texas native Lyndon Johnson in his 1964 landslide.