About This Place
Weldon Spring is a city in St. Charles County, Missouri, United States. The population was 5,270 at the 2000 census. The city is named for its first settler, North Carolina frontiersman John Weldon, who in 1790 built a log home overlooking the spring which bears his name.
Weldon Spring is located at 38°43′00″N 90°38′57″W / 38.716552°N 90.649105°W / 38.716552; -90.649105.
According to the United States Census Bureau, the city has a total area of 8.3 square miles (21.6 km²), of which, 7.9 square miles (20.5 km²) of it is land and 0.4 square miles (1.1 km²) of it (5.16%) is water.