
Weldon Spring
- County:
- St. Charles County
- County Seat:
- No
- Area (mi²):
- 7.647
- State:
- Missouri
Weldon Spring is a city located in St. Charles County, Missouri. Weldon Spring has a 2025 population of 5,217. Weldon Spring is currently declining at a rate of -0.44% annually and its population has decreased by -2.16% since the most recent census, which recorded a population of 5,332 in 2020.
The average household income in Weldon Spring is $202,410 with a poverty rate of 0.34%. The median age in Weldon Spring is 53.5 years: 52.3 years for males, and 55.2 years for females.