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

Counties in Iowa by share of population aged 65 and over

Jefferson County had the highest share of population aged 65 and over of 99 counties in 2023, at 29.8%. Dallas County had the lowest, at 13.5%. The median was 22.7% and the figure for Iowa was 19.3%. Source: the U.S. Census Bureau.

Highest29.8Jefferson County
Lowest13.5Dallas County
Median22.799 counties
Iowa19.3History

Top 40 counties, 2023

CSVChart (SVG)

Jefferson CountyJefferson County: 29.8 %29.8Dickinson CountyDickinson County: 29.7 %29.7Ringgold CountyRinggold County: 27.6 %27.6Cherokee CountyCherokee County: 26.6 %26.6Audubon CountyAudubon County: 26.3 %26.3Clayton CountyClayton County: 26.3 %26.3Kossuth CountyKossuth County: 26.2 %26.2Butler CountyButler County: 26.1 %26.1Greene CountyGreene County: 25.9 %25.9Hancock CountyHancock County: 25.8 %25.8Monona CountyMonona County: 25.6 %25.6Guthrie CountyGuthrie County: 25.5 %25.5Sac CountySac County: 25.5 %25.5Cerro Gordo CountyCerro Gordo County: 25.4 %25.4Fremont CountyFremont County: 25.2 %25.2Pocahontas CountyPocahontas County: 25.2 %25.2Emmet CountyEmmet County: 25.1 %25.1Calhoun CountyCalhoun County: 25 %25Palo Alto CountyPalo Alto County: 25 %25Cass CountyCass County: 24.9 %24.9Page CountyPage County: 24.8 %24.8Appanoose CountyAppanoose County: 24.7 %24.7Winneshiek CountyWinneshiek County: 24.7 %24.7Adams CountyAdams County: 24.7 %24.7Hardin CountyHardin County: 24.6 %24.6Shelby CountyShelby County: 24.5 %24.5Van Buren CountyVan Buren County: 24.5 %24.5Montgomery CountyMontgomery County: 24.4 %24.4Fayette CountyFayette County: 24.3 %24.3Mitchell CountyMitchell County: 24.3 %24.3Adair CountyAdair County: 24.2 %24.2Winnebago CountyWinnebago County: 24.1 %24.1Allamakee CountyAllamakee County: 24.1 %24.1Lee CountyLee County: 24.1 %24.1Worth CountyWorth County: 24 %24Chickasaw CountyChickasaw County: 24 %24Taylor CountyTaylor County: 24 %24Ida CountyIda County: 23.9 %23.9Jackson CountyJackson County: 23.8 %23.8Clay CountyClay County: 23.6 %23.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2023 (%)Change on 2022
1Jefferson County29.8+0.8 pts
2Dickinson County29.7+0.7 pts
3Ringgold County27.6+1.3 pts
4Cherokee County26.6+0.1 pts
5Audubon County26.3+0.2 pts
6Clayton County26.3+0.8 pts
7Kossuth County26.2+0.4 pts
8Butler County26.1+0.5 pts
9Greene County25.9+0.9 pts
10Hancock County25.8+0.6 pts
11Monona County25.6+0.1 pts
12Guthrie County25.5+0.6 pts
13Sac County25.5+0.4 pts
14Cerro Gordo County25.4+0.7 pts
15Fremont County25.2+0.6 pts
16Pocahontas County25.2+0.5 pts
17Emmet County25.1+0.3 pts
18Calhoun County25+0.5 pts
19Palo Alto County25-0 pts
20Cass County24.9+0.3 pts
21Page County24.8+0.6 pts
22Appanoose County24.7+0.3 pts
23Winneshiek County24.7+1.1 pts
24Adams County24.7+0.7 pts
25Hardin County24.6+0.5 pts
26Shelby County24.5+0.1 pts
27Van Buren County24.5+0.3 pts
28Montgomery County24.4+0.6 pts
29Fayette County24.3+0.4 pts
30Mitchell County24.3+0.4 pts
31Adair County24.2+0.4 pts
32Winnebago County24.1+0.4 pts
33Allamakee County24.1+0.2 pts
34Lee County24.1+0.4 pts
35Worth County24+0.6 pts
36Chickasaw County24+0.7 pts
37Taylor County24+0.2 pts
38Ida County23.9+0.3 pts
39Jackson County23.8+0.7 pts
40Clay County23.6+0.4 pts
41Franklin County23.1+0.2 pts
42Keokuk County23.1+0.4 pts
43Osceola County23.1+0.8 pts
44Des Moines County23+0.4 pts
45Floyd County230 pts
46Grundy County22.9+0.4 pts
47Humboldt County22.9+0.8 pts
48Lucas County22.8+0.3 pts
49Poweshiek County22.8+0.5 pts
50Wright County22.7+0.2 pts
51Carroll County22.7+0.4 pts
52Delaware County22.6+0.7 pts
53Monroe County22.5+0.4 pts
54Wayne County22.4+0.5 pts
55Howard County22.3+0.6 pts
56Hamilton County22.2+0.5 pts
57O'Brien County22.2-0.2 pts
58Union County22.2+0.2 pts
59Cedar County22.2+0.7 pts
60Tama County22.2+0.5 pts
61Jones County22.1+0.5 pts
62Washington County21.9+0.3 pts
63Harrison County21.9+0.7 pts
64Iowa County21.8+0.8 pts
65Boone County21.7+0.6 pts
66Henry County21.6+1 pts
67Clinton County21.6+0.5 pts
68Louisa County21.6+0.5 pts
69Decatur County21.5+0.3 pts
70Bremer County21.2+0.4 pts
71Marion County21.1+0.5 pts
72Webster County20.9+0.5 pts
73Clarke County20.8+0.3 pts
74Mills County20.6+0.2 pts
75Jasper County20.6+0.4 pts
76Dubuque County20.6+0.5 pts
77Plymouth County20.5+0.4 pts
78Mahaska County20.3+0.4 pts
79Benton County20.2+0.8 pts
80Buchanan County20+0.3 pts
81Pottawattamie County19.7+0.5 pts
82Marshall County19.6-0 pts
83Crawford County19.5+0.5 pts
84Muscatine County19.4+0.4 pts
85Madison County19.4+0.4 pts
86Wapello County19.4+0.2 pts
87Lyon County18.90 pts
88Black Hawk County18.9+0.3 pts
89Davis County18.8+0.4 pts
90Scott County18.7+0.5 pts
91Linn County18.1+0.5 pts
92Warren County17.7+0.3 pts
93Buena Vista County17.3+0.5 pts
94Sioux County16.9+0.5 pts
95Woodbury County16.2+0.3 pts
96Polk County15.2+0.3 pts
97Story County14.3+0.4 pts
98Johnson County14.2+0.5 pts
99Dallas County13.5+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

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Rank Counties in Iowa 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":"Iowa","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=Iowa&limit=10

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Questions

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

Jefferson County, with 29.8% in 2023, according to the U.S. Census Bureau.

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

Dallas County, with 13.5% in 2023.

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 Iowa: more rankings