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Weldon Spring Heights is a village in St. Charles County, Missouri, United States. The population was 91 at the 2010 census.
Weldon Spring Heights is located at 38°42′19″N 90°41′10″W (38.705185, -90.686092).
According to the United States Census Bureau, the village has a total area of 0.09 square miles (0.23 km2), all land.
As of the census of 2010, there were 91 people, 35 households, and 33 families living in the village. The population density was 1,011.1 inhabitants per square mile (390.4/km2). There were 36 housing units at an average density of 400.0 per square mile (154.4/km2). The racial makeup of the village was 89.0% White, 9.9% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 9.9% of the population.
There were 35 households of which 22.9% had children under the age of 18 living with them, 80.0% were married couples living together, 5.7% had a female householder with no husband present, 8.6% had a male householder with no wife present, and 5.7% were non-families. 2.9% of all households were made up of individuals and 2.9% had someone living alone who was 65 years of age or older.