Demographics

As of the census of 2000, there were 19,636 people, 6,406 households, and 5,823 families residing in the city. The population density was 1,499.6 people per square mile (579.2/km²). There were 6,549 housing units at an average density of 500.2/sq mi (193.2/km²). The racial makeup of the city was 93.14% White, 1.31% African American, 0.39% Native American, 3.15% Asian, 0.03% Pacific Islander, 0.59% from other races, and 1.40% from two or more races. Hispanic or Latino of any race were 3.23% of the population. There were 6,406 households out of which 49.8% had children under the age of 18 living with them, 85.4% were married couples living together, 4.1% had a female householder with no husband present, and 9.1% were non-families. 7.7% of all households were made up of individuals and 1.9% had someone living alone who was 65 years of age or older. The average household size was 3.06 and the average family size was 3.24.

In the city the population was spread out with 31.6% under the age of 18, 4.4% from 18 to 24, 26.1% from 25 to 44, 32.2% from 45 to 64, and 5.6% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 98.4 males. For every 100 females age 18 and over, there were 96.7 males.

According to a 2007 estimate, the median income for a household was $148,789, and the median income for a family was $154,948. Males had a median income of $90,834 versus $42,455 for females. The per capita income for the city was $50,418. About 1.2% of families and 1.4% of the population were below the poverty line, including 1.5% of those under age 18 and 1.7% of those age 65 or over.