As of the census[1] 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).

There were 7,693 households out of which 48.2% had children under the age of 18 living with them, 82.2% were married couples living together, 4.9% had a female householder with no husband present, and 11.5% were non-families. 10.0% of all households were made up of individuals and 3.2% had someone living alone who was 65 years of age or older. The average household size was 3.02 and the average family size was 3.24.

In the city the population was spread out with 31.5% under the age of 18, 4.3% from 18 to 24, 23.6% from 25 to 44, 32.4% from 45 to 64, and 8.2% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 97.1 males. For every 100 females age 18 and over, there were 93.2 males.

The median home price in Brentwood is $679,000. The median household income in Brentwood is $133,668 as of 2007. The per capita income for the city is $56,701. About 1.5% of families and 2.0% of the population were below the poverty line. About 95.4% of residents own their homes.

All information obtained from Wikipedia.com and the US. Census Bureau.

In addition, Williamson County is ranked among the wealthiest counties in the country. In 2006 it was the 11th wealthiest county in the country according to the U.S. Census Bureau, but the Council for Community and Economic Research ranked Williamson County as America's wealthiest county (1st) when the local cost of living was factored into the equation with median household income.[5]

A special census conducted in 2007 counted 35,262 residents.[6]