Median Age in St. Clair County, MO
ACS 2024 5-Year Estimates
46.1 years
Rank #579/3,222 · #13 in MO
82th
St. Clair 46.1 years
MO 39.0 years +18.2%
US 38.9 years +18.5%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How St. Clair County's median age of 46.1 years compares to all 3,222 U.S. counties. Values range from 21.4 years to 86.2 years.
Distribution of Median Age Across All Counties
Ranking Context
Counties ranked closest to St. Clair County for median age.
Nearby Rankings
Full ranking →| #576 | Franklin County, ME | 46.1 years |
| #577 | Traverse County, MN | 46.1 years |
| #578 | Reynolds County, MO | 46.1 years |
| #579 | St. Clair County, MO | 46.1 years |
| #580 | Fillmore County, NE | 46.1 years |
| #581 | Sheridan County, NE | 46.1 years |
| #582 | Valley County, NE | 46.1 years |
About Median Age
St. Clair County, Missouri has a median age of 46.1 years, ranking #579 of 3,222 counties nationwide — 18.5% above the national value of 38.9 years. Within Missouri, it ranks #13 of 115. This places it in the 82th percentile nationally.
The median age of the total population. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.