Weldon Spring is a city in St. Charles County, Missouri, United States. The population was 5,443 at the 2010 census.
Weldon Spring is located at 38°43′00″N 90°38′57″W / 38.716552°N 90.649105°W / 38.716552; -90.649105. It is 27 miles west-northwest of St. Louis.
According to the United States Census Bureau, the city has a total area of 7.64 square miles (19.79 km), of which 7.51 square miles (19.45 km) is land and 0.13 square miles (0.34 km) is water.
As of the census of 2000, there were 5,270 people, 1,880 households, and 1,462 families residing in the city. The population density was 666.0 people per square mile (257.2/km). There were 1,926 housing units at an average density of 243.4 per square mile (94.0/km). The racial makeup of the city was 96.00% White, 1.82% African American, 0.15% Native American, 1.08% Asian, 0.04% Pacific Islander, 0.30% from other races, and 0.61% from two or more races. Hispanic or Latino of any race were 1.10% of the population.
There were 1,880 households out of which 35.7% had children under the age of 18 living with them, 73.1% were married couples living together, 3.4% had a female householder with no husband present, and 22.2% were non-families. 20.1% of all households were made up of individuals and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.09.
In the city the population was spread out with 26.6% under the age of 18, 4.2% from 18 to 24, 24.1% from 25 to 44, 29.0% from 45 to 64, and 16.2% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 89.4 males. For every 100 females age 18 and over, there were 85.3 males.
The median income for a household in the city was $87,998, and the median income for a family was $102,516. Males had a median income of $66,522 versus $40,339 for females. The per capita income for the city was $40,810. About 2.6% of families and 4.4% of the population were below the poverty line, including 2.7% of those under age 18 and 12.5% of those age 65 or over.
According to 2010 census, there were 5,443 people, 2,050 households, and 1,580 families residing in the city. The population density was 724.8 inhabitants per square mile (279.8/km). There were 2,151 housing units at an average density of 286.4 per square mile (110.6/km). The racial makeup of the city was 95.5% White, 1.4% African American, 0.1% Native American, 1.9% Asian, 0.3% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 1.0% of the population.
There were 2,050 households of which 30.8% had children under the age of 18 living with them, 70.9% were married couples living together, 4.0% had a female householder with no husband present, 2.1% had a male householder with no wife present, and 22.9% were non-families. 20.5% of all households were made up of individuals and 13.3% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 3.01.
The median age in the city was 48.7 years. 22.5% of residents were under the age of 18; 6.1% were between the ages of 18 and 24; 14.8% were from 25 to 44; 36.7% were from 45 to 64; and 20.1% were 65 years of age or older. The gender makeup of the city was 47.6% male and 52.4% female.