
Old Jamestown
- County:
- St. Louis County
- County Seat:
- No
- Area (mi²):
- 14.946
- State:
- Missouri
Old Jamestown is a CDP located in St. Louis County, Missouri. Old Jamestown has a 2025 population of 20,688. Old Jamestown is currently growing at a rate of 0.49% annually and its population has increased by 5.54% since the most recent census, which recorded a population of 19,602 in 2020.
The average household income in Old Jamestown is $119,151 with a poverty rate of 6.13%. The median age in Old Jamestown is 39.7 years: 37.5 years for males, and 41.6 years for females.