Brentwood is a city in Williamson County, Tennessee, United States. It is an affluent suburb of Nashville. The population was 37,163 at the 2010 census.
As of the 2000 Census, Brentwood had a land area of 35.4 square miles (92 km2), but an annexation in 2001 increased the area to 40.8 square miles (106 km2).
As of the census of 2000, there were 23,445 people, 7,693 households, and 6,808 families residing in the city. The population density was 676.7 inhabitants per square mile (261.3 /km2). There were 7,889 housing units at an average density of 227.7 per square mile (87.9 /km2). The racial makeup of the city was 94.63% European American, 1.89% African American, 0.16% Native American, 2.50% Asian, 0.19% from other races, and 0.64% from two or more races. Hispanic or Latino of any race were 1.10% of the population. Brentwood is Tennessee's best educated city, proportionately, with 69.4% of adult residents (25 and older) holding an associate degree or higher, and 64.7% of adults possessing a bachelor's degree or higher (2000 Census).