Data / Rankings / Population aged 65 and over / Counties in Illinois

Counties in Illinois by share of population aged 65 and over, 2025

Pope County had the highest share of population aged 65 and over of 102 counties in 2025, at 31.9%. Kendall County had the lowest, at 12.5%. The median was 23% and the figure for Illinois was 18.7%. Source: the U.S. Census Bureau.

Highest31.9Pope County
Lowest12.5Kendall County
Median23102 counties
Illinois18.7History

Top 40 counties, 2025

CSVChart (SVG)

Pope CountyPope County: 31.9 %31.9Jo Daviess CountyJo Daviess County: 31.5 %31.5Hardin CountyHardin County: 31.2 %31.2Henderson CountyHenderson County: 29.5 %29.5Schuyler CountySchuyler County: 28.6 %28.6Alexander CountyAlexander County: 28.5 %28.5Calhoun CountyCalhoun County: 28 %28Gallatin CountyGallatin County: 27.3 %27.3Hancock CountyHancock County: 27 %27Putnam CountyPutnam County: 26.6 %26.6Carroll CountyCarroll County: 26.4 %26.4Scott CountyScott County: 26.4 %26.4Stephenson CountyStephenson County: 26 %26Marshall CountyMarshall County: 25.9 %25.9Edgar CountyEdgar County: 25.6 %25.6Shelby CountyShelby County: 25.3 %25.3Mason CountyMason County: 25.1 %25.1White CountyWhite County: 25 %25Pulaski CountyPulaski County: 25 %25Bureau CountyBureau County: 24.9 %24.9Iroquois CountyIroquois County: 24.9 %24.9Edwards CountyEdwards County: 24.8 %24.8Washington CountyWashington County: 24.7 %24.7Union CountyUnion County: 24.4 %24.4Wabash CountyWabash County: 24.3 %24.3Jersey CountyJersey County: 24.2 %24.2Whiteside CountyWhiteside County: 24.2 %24.2Macoupin CountyMacoupin County: 24.2 %24.2Massac CountyMassac County: 24.2 %24.2Henry CountyHenry County: 24.1 %24.1Saline CountySaline County: 24 %24Mercer CountyMercer County: 23.9 %23.9Knox CountyKnox County: 23.9 %23.9Cumberland CountyCumberland County: 23.7 %23.7Piatt CountyPiatt County: 23.7 %23.7Hamilton CountyHamilton County: 23.7 %23.7Fulton CountyFulton County: 23.7 %23.7Clay CountyClay County: 23.5 %23.5Montgomery CountyMontgomery County: 23.4 %23.4Stark CountyStark County: 23.4 %23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2025 (%)Change on 2024
1Pope County31.9+0.8 pts
2Jo Daviess County31.5+0.5 pts
3Hardin County31.2+0.4 pts
4Henderson County29.5+0.4 pts
5Schuyler County28.6+1.2 pts
6Alexander County28.5+0.6 pts
7Calhoun County28+0.9 pts
8Gallatin County27.3+0.6 pts
9Hancock County27+0.5 pts
10Putnam County26.6+0.7 pts
11Carroll County26.4+0.6 pts
12Scott County26.4+0.9 pts
13Stephenson County26+0.4 pts
14Marshall County25.9+0.4 pts
15Edgar County25.6+0.5 pts
16Shelby County25.3+0.3 pts
17Mason County25.1+0.4 pts
18White County25+0.4 pts
19Pulaski County25+0.4 pts
20Bureau County24.9+0.4 pts
21Iroquois County24.9+0.5 pts
22Edwards County24.8+0.7 pts
23Washington County24.7+0.6 pts
24Union County24.4+0.3 pts
25Wabash County24.3+0.4 pts
26Jersey County24.2+0.5 pts
27Whiteside County24.2+0.4 pts
28Macoupin County24.2+0.4 pts
29Massac County24.2+0.5 pts
30Henry County24.1+0.4 pts
31Saline County24+0.4 pts
32Mercer County23.9+0.3 pts
33Knox County23.9+0.3 pts
34Cumberland County23.7+0.5 pts
35Piatt County23.7+0.3 pts
36Hamilton County23.7+0.3 pts
37Fulton County23.7+0.1 pts
38Clay County23.5+0.4 pts
39Montgomery County23.4+0.4 pts
40Stark County23.4-0.2 pts
41Jasper County23.4+0.1 pts
42Franklin County23.3+0.4 pts
43Greene County23.3+0.2 pts
44Pike County23.3+0.2 pts
45Lee County23.3+0.6 pts
46Richland County23.2+0.4 pts
47Marion County23.2+0.5 pts
48Menard County23.1+0.3 pts
49Clark County23.1+0.3 pts
49Wayne County23.1+0.3 pts
51Christian County23+0.3 pts
52Monroe County22.9+1 pts
53Morgan County22.9+0.6 pts
54Moultrie County22.8+0.4 pts
55Adams County22.8+0.4 pts
56Macon County22.7+0.3 pts
57LaSalle County22.7+0.6 pts
58Livingston County22.7+0.5 pts
59Ford County22.7+0.2 pts
60Perry County22.6+0.5 pts
61De Witt County22.5+0.5 pts
62Crawford County22.5+0.3 pts
63Randolph County22.5+0.4 pts
64Williamson County22.4+0.5 pts
65Warren County22.4+0.2 pts
66Jefferson County22.1+0.2 pts
67Woodford County22.1+0.5 pts
68Johnson County22.1+0.5 pts
69Vermilion County22+0.4 pts
70Logan County21.8+0.3 pts
71Rock Island County21.8+0.3 pts
72Effingham County21.7+0.6 pts
73Tazewell County21.7+0.3 pts
74McDonough County21.7+0.4 pts
75Ogle County21.5+0.4 pts
76Lawrence County21.50 pts
77Sangamon County21.4+0.5 pts
78Clinton County21.1+0.6 pts
79Coles County21+0.4 pts
80Bond County20.6-0 pts
81Madison County20.6+0.5 pts
82Fayette County20.6+0.3 pts
83Douglas County20.4+0.4 pts
84Kankakee County20.3+0.5 pts
85Winnebago County19.9+0.4 pts
86Peoria County19.7+0.3 pts
87St. Clair County19.5+0.6 pts
88DuPage County19.4+0.6 pts
89McHenry County18.9+0.7 pts
90Cass County18.8+0.1 pts
91Jackson County18.7+0.3 pts
92Boone County18.7+0.4 pts
93Brown County18.1+0.5 pts
94Lake County17.9+0.6 pts
95Kane County17.3+0.5 pts
96Cook County17.3+0.4 pts
97Grundy County17.3+0.4 pts
98McLean County16.8+0.5 pts
99Will County16.7+0.5 pts
100DeKalb County16.6+0.4 pts
101Champaign County15.1+0.3 pts
102Kendall County12.5+0.3 pts

Other periods

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Illinois by share of population aged 65 and over using official data, and cite the source.
rank_places {"indicator":"population_65_plus_share","level":"province","within":"Illinois","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=Illinois&limit=10

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Questions

Which county has the highest share of population aged 65 and over?

Pope County, with 31.9% in 2025, according to the U.S. Census Bureau.

Which county has the lowest share of population aged 65 and over?

Kendall County, with 12.5% in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. Retrieved 2026-10-09.

Population aged 65 and over: other rankings

Counties in Illinois: more rankings