Counties in Iowa by gini index

Johnson County had the highest gini index of 99 counties in 2023, at 50.1 index. Monroe County had the lowest, at 37.4 index. The median was 43 index and the figure for Iowa was 44.5 index. Source: the U.S. Census Bureau.

Highest50.1Johnson County
Lowest37.4Monroe County
Median4399 counties
Iowa44.5History

Top 40 counties, 2023

CSVChart (SVG)

Johnson CountyJohnson County: 50.1 index50.1Adams CountyAdams County: 49.8 index49.8Jefferson CountyJefferson County: 48.2 index48.2Story CountyStory County: 47.8 index47.8Wayne CountyWayne County: 47.6 index47.6Cass CountyCass County: 47.1 index47.1Des Moines CountyDes Moines County: 46.5 index46.5Black Hawk CountyBlack Hawk County: 46.2 index46.2Poweshiek CountyPoweshiek County: 46 index46Montgomery CountyMontgomery County: 45.8 index45.8Cerro Gordo CountyCerro Gordo County: 45.8 index45.8Wapello CountyWapello County: 45.7 index45.7Humboldt CountyHumboldt County: 45.7 index45.7Scott CountyScott County: 45.6 index45.6Appanoose CountyAppanoose County: 45.5 index45.5Wright CountyWright County: 45.3 index45.3Adair CountyAdair County: 45.2 index45.2Winnebago CountyWinnebago County: 44.9 index44.9Dubuque CountyDubuque County: 44.7 index44.7Linn CountyLinn County: 44.6 index44.6Page CountyPage County: 44.5 index44.5Shelby CountyShelby County: 44.4 index44.4Franklin CountyFranklin County: 44.4 index44.4Winneshiek CountyWinneshiek County: 44.3 index44.3Calhoun CountyCalhoun County: 44.3 index44.3Audubon CountyAudubon County: 44.2 index44.2Delaware CountyDelaware County: 44.2 index44.2Cherokee CountyCherokee County: 44.1 index44.1Hamilton CountyHamilton County: 44 index44Fayette CountyFayette County: 43.9 index43.9Webster CountyWebster County: 43.8 index43.8Floyd CountyFloyd County: 43.8 index43.8Clinton CountyClinton County: 43.8 index43.8Polk CountyPolk County: 43.7 index43.7Jackson CountyJackson County: 43.7 index43.7Van Buren CountyVan Buren County: 43.7 index43.7Sac CountySac County: 43.7 index43.7Woodbury CountyWoodbury County: 43.6 index43.6Keokuk CountyKeokuk County: 43.6 index43.6Dallas CountyDallas County: 43.5 index43.5
index. Source: U.S. Census Bureau. Retrieved 2026-10-10.

Full ranking

RankCounties2023
index
Change on 2022
1Johnson County50.1+0.7
2Adams County49.8+0.3
3Jefferson County48.2-4.4
4Story County47.80
5Wayne County47.6+1.6
6Cass County47.1+0.1
7Des Moines County46.5-1
8Black Hawk County46.2-0.3
9Poweshiek County46-2
10Montgomery County45.8-1.6
11Cerro Gordo County45.8+0.7
12Wapello County45.7+2.6
13Humboldt County45.7+2.1
14Scott County45.6-0.5
15Appanoose County45.5+1.2
16Wright County45.3+2
17Adair County45.2+1.8
18Winnebago County44.9+1
19Dubuque County44.7+0.4
20Linn County44.60
21Page County44.5-1.2
22Shelby County44.4-0.6
23Franklin County44.4+2.3
24Winneshiek County44.3+0.3
25Calhoun County44.3-0.7
26Audubon County44.2+2.4
27Delaware County44.2+0.4
28Cherokee County44.1+1.6
29Hamilton County44+1.1
30Fayette County43.9-0.9
31Webster County43.80
32Floyd County43.8-0.4
33Clinton County43.8+0.6
34Polk County43.7+0.4
35Jackson County43.7+2
36Van Buren County43.7-2.7
37Sac County43.7-0.3
38Woodbury County43.6+0.7
39Keokuk County43.6-0.8
40Dallas County43.5-0.1
40Decatur County43.5+1.1
42Ringgold County43.4+1
43Dickinson County43.4-0.8
44Mitchell County43.4+2.1
45Jasper County43.3+1
45Lee County43.3-1.5
47Pottawattamie County43.3+0.3
48Crawford County43.1-0.8
49Fremont County43-0.2
50Osceola County43+2.6
51Tama County42.9-0.1
52Lucas County42.8-1.1
53Union County42.7+0.6
54Marion County42.7-0.3
55Guthrie County42.6-0
56Iowa County42.6-2.4
57Clayton County42.5-0.5
58Carroll County42.5+0.5
59Kossuth County42.5+1.9
60Greene County42.5+1.8
60Washington County42.5+3.1
62Mahaska County42.5-0.1
63Clay County42.40
64Harrison County42.4+1.4
65Taylor County42.3+1.3
66Allamakee County42.1+0.1
67Plymouth County42.1+1.2
68Buena Vista County42+0.3
69Bremer County41.8+0.7
70Mills County41.8-1.7
71Hancock County41.7+0.7
72Clarke County41.7-3.3
73Emmet County41.7-1.1
74Muscatine County41.3+0.6
75Ida County41.3-2
76Howard County41.2-0.7
77Davis County41.2+1.1
78Sioux County41.1+0.5
79Chickasaw County40.8+1.6
79Hardin County40.80
81Palo Alto County40.7-1.4
82Boone County40.6+0.1
83Louisa County40.5-2.1
84Pocahontas County40.5+0.5
85Monona County40.3+0.3
86Buchanan County40.3-0.1
87Henry County40.1+0.5
88O'Brien County39.9+0.3
89Warren County39.5-0.2
90Lyon County39.4+0.6
91Madison County39.3+2.3
92Benton County39.2+0.3
93Butler County39-1.7
94Marshall County38.9-0.6
95Jones County38.8-0.7
96Worth County38.6-1.6
97Cedar County38.5+0.4
98Grundy County37.6+0.3
99Monroe County37.4-2.4

Other periods

About this ranking

Income inequality on a 0 to 100 scale, where 0 is perfect equality.

Eurostat, equivalised disposable income after social transfers (EU-SILC), for the EU and its countries. For other countries use gini_index_world_bank, which is measured on a different basis. For the United States, ACS five-year estimate B19083 measures inequality in household money income before taxes. Census publishes a coefficient from 0 to 1; Invokely multiplies it by 100. The displayed year is the final year of the five-year period. Negative household incomes are treated as zero. This differs from the EU-SILC measure based on equivalised disposable income and should not be treated as directly comparable.

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. American Community Survey 5-year estimates, table B19083: Gini index of household income inequality (coefficient multiplied by 100). https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b19083.dat. Retrieved 2026-10-10.

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Questions

Which county has the highest gini index?

Johnson County, with 50.1 index in 2023, according to the U.S. Census Bureau.

Which county has the lowest gini index?

Monroe County, with 37.4 index 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, American Community Survey 5-year estimates, table B19083: Gini index of household income inequality (coefficient multiplied by 100). Retrieved 2026-10-10.

Gini index: other rankings

Counties in Iowa: more rankings