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 2026 population of 5,304. Weldon Spring is currently growing at a rate of 0.42% annually but its population has decreased by -0.54% since the most recent census, which recorded a population of 5,333 in 2020.
The median household income in Weldon Spring is $158,548 with a poverty rate of 0.74%. The median age in Weldon Spring is 52.2 years: 51.6 years for males, and 52.6 years for females. For every 100 females there are 98.7 males.