Public Data Map Platform · ACS 2024 5-year

Illinois County Median Age

Explore ACS 2024 five-year median-age estimates across all 102 Illinois counties.

Source: U.S. Census Bureau, American Community Survey. Geography: Census TIGER/Line county boundaries (2025).

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Illinois counties

Median age

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County ranking

102 counties · default order follows the validated publication bundle.

Median age distribution

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Illinois county Median age estimates. Select sortable headings to reorder; select a county name for detail.
41.4 ±0.4
48.0 ±1.5
39.7 ±0.6
39.7 ±0.7
41.0 ±1.5
44.1 ±0.5
48.8 ±0.8
45.4 ±0.5
38.3 ±0.9
30.7 ±0.1
43.2 ±0.6
42.6 ±0.8
40.4 ±0.8
41.5 ±0.7
37.5 ±0.6
38.0 ±0.1
42.6 ±0.5
43.1 ±0.6
32.7 ±0.4
43.7 ±0.7
38.7 ±0.8
40.2 ±0.2
46.6 ±0.5
44.7 ±0.4
40.0 ±0.4
41.9 ±0.8
41.9 ±0.9
43.4 ±0.5
43.9 ±0.3
46.7 ±0.5
43.4 ±0.4
38.3 ±0.6
43.9 ±1.3
46.9 ±0.5
53.6 ±1.2
50.2 ±0.4
43.6 ±0.3
44.4 ±0.3
32.4 ±0.3
44.3 ±0.7
41.2 ±0.4
43.7 ±1.2
51.5 ±0.4
41.4 ±1.2
38.8 ±0.2
39.0 ±0.5
36.3 ±0.3
42.6 ±0.4
39.1 ±0.2
42.2 ±0.3
40.7 ±0.4
43.1 ±0.5
41.8 ±0.6
41.1 ±0.7
34.9 ±0.6
40.7 ±0.3
34.3 ±0.2
40.6 ±0.4
44.2 ±0.3
40.2 ±0.2
41.5 ±0.5
46.1 ±0.4
45.4 ±0.3
44.7 ±0.6
42.8 ±1.2
44.7 ±0.3
43.2 ±0.5
42.8 ±0.5
41.1 ±0.9
40.1 ±0.7
42.2 ±0.4
38.1 ±0.3
42.0 ±0.9
42.8 ±1.1
43.0 ±1.2
53.9 ±4.2
43.0 ±1.5
47.4 ±0.9
43.7 ±0.5
42.3 ±1.2
40.3 ±0.3
39.9 ±0.3
43.8 ±1.4
41.0 ±0.2
49.1 ±1.5
46.0 ±0.6
45.3 ±0.3
44.4 ±0.6
45.3 ±0.5
41.9 ±0.3
44.3 ±0.5
41.3 ±0.4
43.2 ±0.5
38.5 ±0.7
44.2 ±0.5
42.8 ±0.2
44.3 ±0.5
43.0 ±0.3
39.1 ±0.2
41.6 ±0.3
39.6 ±0.2
40.4 ±0.5

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Method and limitations

The displayed value is the ACS Data Profile DP05_0018E direct median-age estimate in years.

This is a five-year ACS survey estimate. DP05_0018M is the ACS 90-percent-confidence MOE. null estimate with source state valid, missing, suppressed, or invalid; zero remains valid. Five equal-width color bands span the valid values in this state; colors are not comparable across states.

See the ACS user notes and the downloadable provenance file for definitions, source fields, inputs, retrieval receipt, and checksums.