Thunderbird Bay is located in north-central Brown County along the northern arm of Lake Brownwood, a reservoir on Pecan Bayou. By road, the CDP is 20 miles (32 km) north of Brownwood, the county seat.
According to the United States Census Bureau, the CDP has a total area of 2.9 square miles (7.6 km2), of which 2.5 square miles (6.6 km2) is land and 0.39 square miles (1.0 km2), or 13.42%, is water.[3]
Demographics
2020 census
Thunderbird Bay racial composition[4] (NH = Non-Hispanic)[a]
^Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.[5][6]