Median Age in Jefferson County, MO
ACS 2024 5-Year Estimates
40.3 years
Rank #2,030/3,222 · #69 in MO
37th
Jefferson 40.3 years
MO 39.0 years +3.3%
US 38.9 years +3.6%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Jefferson County's median age of 40.3 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 Jefferson County for median age.
Nearby Rankings
Full ranking →| #2,027 | Leake County, MS | 40.3 years |
| #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 |
About Median Age
Jefferson County, Missouri has a median age of 40.3 years, ranking #2,030 of 3,222 counties nationwide — 3.6% above the national value of 38.9 years. Within Missouri, it ranks #69 of 115. This places it in the 37th 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.