# Counties in Illinois by median age, 2024

All 102 values come from U.S. Census Bureau for 2024, so the places are comparable.

- Indicator id: `median_age`
- Unit: years
- Definition: Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.
- Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population (https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/median-age/illinois-counties
- CSV: https://invokely.ai/download/rankings/median-age/illinois-counties.csv

| Rank | Place | years |
|---:|---|---:|
| 1 | Pope County | 53.9 |
| 2 | Hardin County | 53.6 |
| 3 | Jo Daviess County | 51.5 |
| 4 | Henderson County | 50.2 |
| 5 | Schuyler County | 49.1 |
| 6 | Calhoun County | 48.8 |
| 7 | Alexander County | 48 |
| 8 | Putnam County | 47.4 |
| 9 | Hancock County | 46.9 |
| 10 | Gallatin County | 46.7 |
| 11 | Edgar County | 46.6 |
| 12 | Marshall County | 46.1 |
| 13 | Scott County | 46 |
| 14 | Carroll County | 45.4 |
| 14 | Mason County | 45.4 |
| 16 | Shelby County | 45.3 |
| 16 | Stephenson County | 45.3 |
| 18 | Edwards County | 44.7 |
| 18 | Massac County | 44.7 |
| 18 | Mercer County | 44.7 |
| 21 | Iroquois County | 44.4 |
| 21 | Stark County | 44.4 |
| 23 | Jasper County | 44.3 |
| 23 | Union County | 44.3 |
| 23 | White County | 44.3 |
| 26 | Macoupin County | 44.2 |
| 26 | Washington County | 44.2 |
| 28 | Bureau County | 44.1 |
| 29 | Fulton County | 43.9 |
| 29 | Hamilton County | 43.9 |
| 31 | Saline County | 43.8 |
| 32 | De Witt County | 43.7 |
| 32 | Jersey County | 43.7 |
| 32 | Randolph County | 43.7 |
| 35 | Henry County | 43.6 |
| 36 | Franklin County | 43.4 |
| 36 | Greene County | 43.4 |
| 38 | Christian County | 43.2 |
| 38 | Monroe County | 43.2 |
| 38 | Wabash County | 43.2 |
| 41 | Cumberland County | 43.1 |
| 41 | Lee County | 43.1 |
| 43 | Pike County | 43 |
| 43 | Pulaski County | 43 |
| 43 | Whiteside County | 43 |
| 46 | Menard County | 42.8 |
| 46 | Montgomery County | 42.8 |
| 46 | Piatt County | 42.8 |
| 46 | Wayne County | 42.8 |
| 50 | Clark County | 42.6 |
| 50 | Crawford County | 42.6 |
| 50 | Knox County | 42.6 |
| 53 | Richland County | 42.3 |
| 54 | LaSalle County | 42.2 |
| 54 | Ogle County | 42.2 |
| 56 | Perry County | 42 |
| 57 | Fayette County | 41.9 |
| 57 | Ford County | 41.9 |
| 57 | Tazewell County | 41.9 |
| 60 | Livingston County | 41.8 |
| 61 | Williamson County | 41.6 |
| 62 | Clinton County | 41.5 |
| 62 | Marion County | 41.5 |
| 64 | Adams County | 41.4 |
| 64 | Johnson County | 41.4 |
| 66 | Vermilion County | 41.3 |
| 67 | Jefferson County | 41.2 |
| 68 | Logan County | 41.1 |
| 68 | Morgan County | 41.1 |
| 70 | Brown County | 41 |
| 70 | Sangamon County | 41 |
| 72 | Lawrence County | 40.7 |
| 72 | McHenry County | 40.7 |
| 74 | Macon County | 40.6 |
| 75 | Clay County | 40.4 |
| 75 | Woodford County | 40.4 |
| 77 | Rock Island County | 40.3 |
| 78 | DuPage County | 40.2 |
| 78 | Madison County | 40.2 |
| 80 | Moultrie County | 40.1 |
| 81 | Effingham County | 40 |
| 82 | St. Clair County | 39.9 |
| 83 | Bond County | 39.7 |
| 83 | Boone County | 39.7 |
| 85 | Winnebago County | 39.6 |
| 86 | Lake County | 39.1 |
| 86 | Will County | 39.1 |
| 88 | Kankakee County | 39 |
| 89 | Kane County | 38.8 |
| 90 | Douglas County | 38.7 |
| 91 | Warren County | 38.5 |
| 92 | Cass County | 38.3 |
| 92 | Grundy County | 38.3 |
| 94 | Peoria County | 38.1 |
| 95 | Cook County | 38 |
| 96 | Coles County | 37.5 |
| 97 | Kendall County | 36.3 |
| 98 | McDonough County | 34.9 |
| 99 | McLean County | 34.3 |
| 100 | DeKalb County | 32.7 |
| 101 | Jackson County | 32.4 |
| 102 | Champaign County | 30.7 |