Median Age in Jefferson County, MT
ACS 2024 5-Year Estimates
47.1 years
Rank #458/3,222 · #19 in MT
86th
Jefferson 47.1 years
MT 40.4 years +16.6%
US 38.9 years +21.1%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Jefferson County's median age of 47.1 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 Jefferson County for median age.
Nearby Rankings
Full ranking →| #455 | Northwest Hills Planning Region, CT | 47.1 years |
| #456 | Taliaferro County, GA | 47.1 years |
| #457 | Lyon County, KY | 47.1 years |
| #458 | Jefferson County, MT | 47.1 years |
| #459 | Avery County, NC | 47.1 years |
| #460 | Hyde County, NC | 47.1 years |
| #461 | McIntosh County, OK | 47.1 years |
About Median Age
Jefferson County, Montana has a median age of 47.1 years, ranking #458 of 3,222 counties nationwide — 21.1% above the national value of 38.9 years. Within Montana, it ranks #19 of 56. This places it in the 86th 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.