Median Age in St. Charles County, MO
ACS 2024 5-Year Estimates
39.8 years
Rank #2,178/3,222 · #78 in MO
32th
St. Charles 39.8 years
MO 39.0 years +2.1%
US 38.9 years +2.3%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How St. Charles County's median age of 39.8 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. Charles County for median age.
Nearby Rankings
Full ranking →| #2,175 | Washington County, MN | 39.8 years |
| #2,176 | Clay County, MS | 39.8 years |
| #2,177 | Livingston County, MO | 39.8 years |
| #2,178 | St. Charles County, MO | 39.8 years |
| #2,179 | Liberty County, MT | 39.8 years |
| #2,180 | Clinton County, PA | 39.8 years |
| #2,181 | Lexington County, SC | 39.8 years |
About Median Age
St. Charles County, Missouri has a median age of 39.8 years, ranking #2,178 of 3,222 counties nationwide — 2.3% above the national value of 38.9 years. Within Missouri, it ranks #78 of 115. This places it in the 32th 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.