Median Age in Marion County, OH
ACS 2024 5-Year Estimates
40.1 years
Rank #2,094/3,222 · #66 in OH
35th
Marion 40.1 years
OH 39.7 years +1.0%
US 38.9 years +3.1%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How Marion County's median age of 40.1 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 Marion County for median age.
Nearby Rankings
Full ranking →| #2,091 | Rensselaer County, NY | 40.1 years |
| #2,092 | Delaware County, OH | 40.1 years |
| #2,093 | Huron County, OH | 40.1 years |
| #2,094 | Marion County, OH | 40.1 years |
| #2,095 | Warren County, OH | 40.1 years |
| #2,096 | Linn County, OR | 40.1 years |
| #2,097 | Greenwood County, SC | 40.1 years |
About Median Age
Marion County, Ohio has a median age of 40.1 years, ranking #2,094 of 3,222 counties nationwide — 3.1% above the national value of 38.9 years. Within Ohio, it ranks #66 of 88. This places it in the 35th 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.