Coordinates: 38°30′10″N 90°38′42″W / 38.502736°N 90.645075°W / 38.502736; -90.645075
According to the United States Census Bureau, the city has a total area of 10.45 square miles (27.07 km), of which 10.35 square miles (26.81 km) is land and 0.10 square miles (0.26 km) is water.
As of the 2010 census, there were 10,189 people, 3,474 households, and 2,758 families residing in the city. The population density was 984.4 inhabitants per square mile (380.1/km). There were 3,683 housing units at an average density of 355.8 per square mile (137.4/km). The racial makeup of the city was 94.9% White, 0.8% African American, 0.2% Native American, 1.9% Asian, 0.1% Pacific Islander, 0.3% from other races, and 1.7% from two or more races. Hispanic or Latino of any race were 2.0% of the population.
There were 3,474 households of which 46.9% had children under the age of 18 living with them, 66.2% were married couples living together, 9.3% had a female householder with no husband present, 3.9% had a male householder with no wife present, and 20.6% were non-families. 17.2% of all households were made up of individuals and 5.9% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.27.
The median age in the city was 37.1 years. 30.9% of residents were under the age of 18; 6% were between the ages of 18 and 24; 26.6% were from 25 to 44; 26.7% were from 45 to 64, and 9.6% were 65 years of age or older. The gender makeup of the city was 49.6% male and 50.4% female.
As of the 2000 census, there were 7,676 people in the city, organized into 2,487 households and two families. Its population density was 763.7 people per square mile (294.9/km²). There were 2,622 housing units at an average density of 260.9 per square mile (100.7/km²). The racial makeup of the city was 97.38% White, 0.82% Asian, 0.57% Black or African American, 0.20% Native American, no Pacific Islanders, 0.26% from other races, and 0.77% from two or more races. 1.22% of the population were Hispanic or Latino of any race.
There were 2,487 households out of which half have children under the age of 18 living with them, 71.6% were married couples living together, 8.2% had a female householder with no husband present, and 17.0% were non-families. 13.8% of all households were made up of individuals and 4.3% had someone living alone who was 65 years of age or older. The average household size was 2.98 and the average family size was 3.30.
In the city, the population was spread out with 31.9% under the age of 18, 5.7% from 18 to 24, 34.4% from 25 to 44, 19.5% from 45 to 64, and 8.5% 65 years of age or older. The median age was 34 years. For every 100 females, there were 94.9 males. For every 100 females age 18 and over, there were 89.6 males.
The median income for a household in the city was $74,301, and the median income for a family was $80,625. Males had a median income of $51,799 compared to $33,269 for females. The per capita income for the city was $27,553. 2.2% of the population and 1.3% of families were below the poverty line. Out of the total population, 3.1% of those under the age of 18 and 5.9% of those 65 and older were living below the poverty line.