As of the census of 2008, there were 20,775 people, 7,952 households, and 5,550 families residing in the town. The population density was 1,097.3 people per square mile (423.7/km²). There were 8,163 housing units at an average density of 431.1 per square mile (166.5/km²). The racial makeup of the town was 84.5% White, 7.9% African American, 0.1% Native American, 3.01% Asian, 0.02% Pacific Islander, 0.51% from other races, and 0.95% from two or more races. Hispanic or Latino of any race were 6.42% of the population.
There were 7,952 households out of which 30.9% had children under the age of 18 living with them, 58.4% were married couples living together, 8.9% had a female householder with no husband present, and 30.2% were non-families. 25.4% of all households were made up of individuals and 12.3% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.12.
In the town the population was spread out with 23.6% under the age of 18, 5.6% from 18 to 24, 29.9% from 25 to 44, 24.0% from 45 to 64, and 16.9% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 89.4 males. For every 100 females age 18 and over, there were 85.2 males.
The median income for a household in the town was $69,260, and the median income for a family was $82,904. Males had a median income of $52,216 versus $40,755 for females. The per capita income for the town was $33,510. About 5.2% of families and 7.2% of the population were below the poverty line, including 4.7% of those under age 18 and 9.5% of those age 65 or over.