# Counties in Missouri by median age on 1 July (US county estimates), 2025

All 115 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `median_age_pep`
- Unit: years
- Definition: Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.
- Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (https://www.census.gov/programs-surveys/popest/data/data-sets.html)
- Publisher page: https://invokely.ai/en/publishers/us-census-bureau
- Retrieved: 2026-10-12
- Citation: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/median-age-july-1-us-counties/missouri-counties

| Rank | Place | years |
|---:|---|---:|
| 1 | Stone County | 54.5 |
| 2 | Hickory County | 53.8 |
| 3 | Benton County | 53.7 |
| 4 | Camden County | 52.9 |
| 5 | Ozark County | 49.3 |
| 6 | Worth County | 48.4 |
| 7 | Wayne County | 48.2 |
| 8 | Ralls County | 47 |
| 8 | Reynolds County | 47 |
| 10 | Dade County | 46.6 |
| 11 | Gasconade County | 46.4 |
| 12 | Chariton County | 45.7 |
| 12 | Holt County | 45.7 |
| 14 | Monroe County | 45.6 |
| 14 | Morgan County | 45.6 |
| 16 | St. Clair County | 45.5 |
| 17 | Atchison County | 45.2 |
| 17 | Maries County | 45.2 |
| 19 | Carroll County | 44.8 |
| 20 | Montgomery County | 44.6 |
| 20 | Putnam County | 44.6 |
| 22 | Dent County | 44.4 |
| 23 | Henry County | 44.3 |
| 23 | Iron County | 44.3 |
| 23 | Ste. Genevieve County | 44.3 |
| 26 | Crawford County | 43.8 |
| 27 | Douglas County | 43.7 |
| 28 | Clark County | 43.6 |
| 28 | Mercer County | 43.6 |
| 30 | Shannon County | 43.4 |
| 31 | Carter County | 43.3 |
| 31 | DeKalb County | 43.3 |
| 33 | Macon County | 43.2 |
| 33 | Oregon County | 43.2 |
| 35 | Cedar County | 43.1 |
| 35 | Perry County | 43.1 |
| 37 | Bollinger County | 42.9 |
| 37 | Shelby County | 42.9 |
| 37 | Taney County | 42.9 |
| 40 | Madison County | 42.7 |
| 40 | Texas County | 42.7 |
| 42 | Andrew County | 42.6 |
| 42 | Dallas County | 42.6 |
| 44 | Harrison County | 42.5 |
| 45 | Franklin County | 42.4 |
| 45 | Sullivan County | 42.4 |
| 47 | Caldwell County | 42.3 |
| 47 | Clinton County | 42.3 |
| 49 | Barry County | 42.1 |
| 49 | Linn County | 42.1 |
| 51 | Cooper County | 42 |
| 51 | Miller County | 42 |
| 51 | New Madrid County | 42 |
| 51 | Ray County | 42 |
| 51 | Stoddard County | 42 |
| 51 | Washington County | 42 |
| 57 | Knox County | 41.9 |
| 58 | Mississippi County | 41.8 |
| 59 | Bates County | 41.6 |
| 59 | Howell County | 41.6 |
| 61 | Lafayette County | 41.5 |
| 62 | Barton County | 41.4 |
| 62 | Warren County | 41.4 |
| 64 | Jefferson County | 41.3 |
| 65 | Daviess County | 41.2 |
| 65 | Livingston County | 41.2 |
| 65 | Osage County | 41.2 |
| 65 | St. Louis County | 41.2 |
| 69 | Pike County | 41.1 |
| 70 | Marion County | 40.7 |
| 70 | St. Francois County | 40.7 |
| 72 | Cass County | 40.6 |
| 72 | Cole County | 40.6 |
| 72 | Ripley County | 40.6 |
| 72 | St. Charles County | 40.6 |
| 76 | Butler County | 40.5 |
| 76 | Laclede County | 40.5 |
| 78 | Randolph County | 40.4 |
| 79 | Callaway County | 40 |
| 80 | Newton County | 39.9 |
| 81 | Audrain County | 39.8 |
| 81 | Howard County | 39.8 |
| 81 | Scott County | 39.8 |
| 84 | Dunklin County | 39.7 |
| 84 | Wright County | 39.7 |
| 86 | Grundy County | 39.6 |
| 86 | Platte County | 39.6 |
| 88 | Christian County | 39.4 |
| 89 | Buchanan County | 39.3 |
| 89 | Gentry County | 39.3 |
| 89 | Lewis County | 39.3 |
| 92 | Vernon County | 39.1 |
| 93 | Lawrence County | 39 |
| 94 | Moniteau County | 38.9 |
| 94 | Pemiscot County | 38.9 |
| 94 | Schuyler County | 38.9 |
| 97 | Polk County | 38.8 |
| 98 | Clay County | 38.5 |
| 99 | McDonald County | 38.2 |
| 100 | Cape Girardeau County | 38.1 |
| 101 | Pettis County | 38 |
| 102 | Lincoln County | 37.7 |
| 103 | Greene County | 37.5 |
| 104 | Jackson County | 37.4 |
| 105 | St. Louis city | 37.3 |
| 106 | Saline County | 36.8 |
| 107 | Jasper County | 36.7 |
| 107 | Webster County | 36.7 |
| 109 | Phelps County | 36 |
| 110 | Scotland County | 35.2 |
| 111 | Boone County | 33.4 |
| 112 | Nodaway County | 32.4 |
| 113 | Johnson County | 31.8 |
| 114 | Adair County | 29.8 |
| 115 | Pulaski County | 28.1 |