Median Age in St. Louis County, MO
ACS 2024 5-Year Estimates
How St. Louis County Compares
National Distribution
Where St. Louis County falls among all 3,222 U.S. counties for median age.
■ St. Louis County: 40.3 years
Ranking Context
| Rank | County | Value |
|---|---|---|
| #2,028 | Daviess County, MO | 40.3 years |
| #2,029 | Howell County, MO | 40.3 years |
| #2,030 | Jefferson County, MO | 40.3 years |
| #2,031 | St. Louis County, MO | 40.3 years |
| #2,032 | Saunders County, NE | 40.3 years |
| #2,033 | Scotts Bluff County, NE | 40.3 years |
| #2,034 | Socorro County, NM | 40.3 years |
Median Age in St. Louis County, Missouri
St. Louis County, Missouri has a median age of 40.3 years, which ranks #2,031 of 3,222 out of 3,222 counties nationwide. This is 3.6% above the national value of 38.9 years.
Within Missouri, St. Louis County ranks #70 of 115 out of 115 counties. This places it in the 37th percentile nationally.
The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.