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

Counties in Iowa by share of population aged 65 and over

Dickinson County had the highest share of population aged 65 and over of 99 counties in 2021, at 28.2%. Dallas County had the lowest, at 12.9%. The median was 21.9% and the figure for Iowa was 18.4%. Source: the U.S. Census Bureau.

Highest28.2Dickinson County
Lowest12.9Dallas County
Median21.999 counties
Iowa18.4History

Top 40 counties, 2021

CSVChart (SVG)

Dickinson CountyDickinson County: 28.2 %28.2Jefferson CountyJefferson County: 28.1 %28.1Ringgold CountyRinggold County: 26.2 %26.2Cherokee CountyCherokee County: 26 %26Audubon CountyAudubon County: 25.5 %25.5Kossuth CountyKossuth County: 25.4 %25.4Butler CountyButler County: 25.1 %25.1Hancock CountyHancock County: 25 %25Monona CountyMonona County: 25 %25Clayton CountyClayton County: 24.9 %24.9Sac CountySac County: 24.8 %24.8Greene CountyGreene County: 24.7 %24.7Cass CountyCass County: 24.4 %24.4Pocahontas CountyPocahontas County: 24.4 %24.4Guthrie CountyGuthrie County: 24.3 %24.3Palo Alto CountyPalo Alto County: 24.2 %24.2Taylor CountyTaylor County: 24.1 %24.1Calhoun CountyCalhoun County: 24.1 %24.1Cerro Gordo CountyCerro Gordo County: 24.1 %24.1Appanoose CountyAppanoose County: 24 %24Hardin CountyHardin County: 23.9 %23.9Emmet CountyEmmet County: 23.9 %23.9Page CountyPage County: 23.8 %23.8Shelby CountyShelby County: 23.8 %23.8Van Buren CountyVan Buren County: 23.7 %23.7Adams CountyAdams County: 23.6 %23.6Fremont CountyFremont County: 23.5 %23.5Montgomery CountyMontgomery County: 23.5 %23.5Fayette CountyFayette County: 23.4 %23.4Allamakee CountyAllamakee County: 23.4 %23.4Lee CountyLee County: 23.4 %23.4Mitchell CountyMitchell County: 23.3 %23.3Adair CountyAdair County: 23.3 %23.3Ida CountyIda County: 23.3 %23.3Worth CountyWorth County: 23 %23Winnebago CountyWinnebago County: 22.9 %22.9Winneshiek CountyWinneshiek County: 22.8 %22.8Clay CountyClay County: 22.8 %22.8Floyd CountyFloyd County: 22.7 %22.7Jackson CountyJackson County: 22.6 %22.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2021 (%)Change on 2020
1Dickinson County28.2+0.5 pts
2Jefferson County28.1+0.6 pts
3Ringgold County26.2-0 pts
4Cherokee County26+0.6 pts
5Audubon County25.5+0.2 pts
6Kossuth County25.4+0.7 pts
7Butler County25.1+0.5 pts
8Hancock County25+0.5 pts
9Monona County250 pts
10Clayton County24.9+0.4 pts
11Sac County24.8+0.3 pts
12Greene County24.7+0.7 pts
13Cass County24.4+0.2 pts
14Pocahontas County24.4+0.4 pts
15Guthrie County24.3+0.4 pts
16Palo Alto County24.2+0.7 pts
17Taylor County24.1-0 pts
18Calhoun County24.1+0.6 pts
19Cerro Gordo County24.1+0.7 pts
20Appanoose County24-0 pts
21Hardin County23.9+0.4 pts
22Emmet County23.9+0.3 pts
23Page County23.8+0.4 pts
24Shelby County23.8+0.4 pts
25Van Buren County23.7+0.5 pts
26Adams County23.6+0.6 pts
27Fremont County23.5+0.5 pts
28Montgomery County23.5+0.2 pts
29Fayette County23.4+0.5 pts
30Allamakee County23.4+0.4 pts
31Lee County23.4+0.5 pts
32Mitchell County23.3+0.3 pts
33Adair County23.3-0.3 pts
34Ida County23.30 pts
35Worth County23+0.8 pts
36Winnebago County22.9+0.4 pts
37Winneshiek County22.8+0.8 pts
38Clay County22.8+0.7 pts
39Floyd County22.7+0.3 pts
40Jackson County22.6+0.4 pts
41Chickasaw County22.5+0.5 pts
42Keokuk County22.4+0.4 pts
43Franklin County22.4+0.3 pts
44Wright County22.3+0.4 pts
45O'Brien County22.30 pts
46Lucas County22.2+0.2 pts
47Des Moines County22.1+0.3 pts
48Grundy County22+0.3 pts
49Carroll County21.9+0.3 pts
50Humboldt County21.9+0.6 pts
51Poweshiek County21.9+0.3 pts
52Osceola County21.9+0.5 pts
53Howard County21.6+0.1 pts
54Hamilton County21.6+0.4 pts
55Union County21.6+0.3 pts
56Monroe County21.5-0.1 pts
57Jones County21.4+0.3 pts
58Wayne County21.4+0.3 pts
59Delaware County21.3+0.6 pts
60Tama County21.2+0.5 pts
61Washington County21.1+0.3 pts
62Cedar County21.1+0.5 pts
63Harrison County21+0.1 pts
64Decatur County20.9+0.2 pts
65Clinton County20.7+0.4 pts
66Louisa County20.6+0.7 pts
67Bremer County20.6+0.2 pts
68Boone County20.5+0.2 pts
69Iowa County20.4+0.5 pts
70Marion County20.2+0.5 pts
71Henry County20.2+0.2 pts
72Clarke County20-0 pts
73Mills County20+0.5 pts
74Jasper County19.9+0.4 pts
75Webster County19.80 pts
76Mahaska County19.7+0.4 pts
77Dubuque County19.6+0.6 pts
78Marshall County19.5+0.2 pts
79Plymouth County19.5+0.3 pts
80Buchanan County19.3+0.4 pts
81Wapello County18.9+0.2 pts
82Benton County18.9+0.3 pts
83Lyon County18.8+0.2 pts
84Crawford County18.7+0.6 pts
85Madison County18.7+0.5 pts
86Pottawattamie County18.6+0.4 pts
87Muscatine County18.6+0.5 pts
88Black Hawk County18.2+0.4 pts
89Davis County18.1+0.3 pts
90Scott County17.7+0.4 pts
91Warren County17.2+0.1 pts
92Linn County17.1+0.5 pts
93Buena Vista County16.3+0.1 pts
94Sioux County16+0.2 pts
95Woodbury County15.6+0.2 pts
96Polk County14.5+0.3 pts
97Story County13.6+0.3 pts
98Johnson County13.2+0.4 pts
99Dallas County12.9+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.

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Rank Counties in Iowa by share of population aged 65 and over using official data, and cite the source.
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Questions

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

Dickinson County, with 28.2% in 2021, according to the U.S. Census Bureau.

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

Dallas County, with 12.9% in 2021.

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