Median Age in Gallatin County, MT
ACS 2024 5-Year Estimates
34.2 years
Rank #3,022/3,222 · #53 in MT
6th
Gallatin 34.2 years
MT 40.4 years -15.3%
US 38.9 years -12.1%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Gallatin County's median age of 34.2 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 Gallatin County for median age.
Nearby Rankings
Full ranking →| #3,019 | Menominee County, WI | 34.3 years |
| #3,020 | Columbia County, AR | 34.2 years |
| #3,021 | Yuba County, CA | 34.2 years |
| #3,022 | Gallatin County, MT | 34.2 years |
| #3,023 | Centre County, PA | 34.2 years |
| #3,024 | Rutherford County, TN | 34.2 years |
| #3,025 | Faulkner County, AR | 34.1 years |
About Median Age
Gallatin County, Montana has a median age of 34.2 years, ranking #3,022 of 3,222 counties nationwide — 12.1% below the national value of 38.9 years. Within Montana, it ranks #53 of 56. This places it in the 6th 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.