Brazoria County is a county in the U.S. state of Texas located on the Gulf Coast within the Baytown metropolitan area. Its county seat is Angleton, and it's largest city is Pearland. As of the 2000 U.S. Census, the county had a population of 241,767. According to the U.S. Census Bureau, the county has a total area of 4,137 km² (1,597 mi²). 3,591 km² (1,386 mi²) of it is land and 547 km² (211 mi²) of it (13.21%) is water. There were 81,954 households out of which 40.80% had children under the age of 18 living with them, 62.20% were married couples living together, 10.40% had a female householder with no husband present, and 23.00% were non-families. 19.10% of all households were made up of individuals and 6.40% had someone living alone who was 65 years of age or older. The average household size was 2.82 and the average family size was 3.23.

As of the census² of 2000, there were 241,767 people, 81,954 households, and 63,104 families residing in the county. The population density was 67/km² (174/mi²). There were 90,628 housing units at an average density of 25/km² (65/mi²). The racial makeup of the county was 77.09% White, 8.50% Black or African American, 0.53% Native American, 2.00% Asian, 0.03% Pacific Islander, 9.63% from other races, and 2.22% from two or more races. 22.78% of the population were Hispanic or Latino of any race.