RANKING · 2020 CENSUS · 25 SHOWN OF 25

Highest Australian population share, Iowa counties · 2020

Iowa counties ranked by the share of all residents who are Australian ancestry (2023 American Community Survey). A concentration measure: Australian residents as a percentage of total population. This list covers the 25 counties in Iowa that qualify, ranked against each other statewide.

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RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

Highest Australian population share by state

RANKPLACESTATEPOPAUSTRALIAN SHAREVS 2000

01Mitchell County, IAIA10,6500.3%–

02Emmet County, IAIA9,1070.3%–

03Hardin County, IAIA16,4550.2%–

04Warren County, IAIA57,3310.2%–

05Lucas County, IAIA8,8470.1%–

06Decatur County, IAIA7,6550.1%–

07Worth County, IAIA7,3380.1%–

08Webster County, IAIA36,8380.1%–

09Muscatine County, IAIA41,8530.1%–

10Poweshiek County, IAIA18,3680.1%–

11Clinton County, IAIA46,0020.1%–

12Johnson County, IAIA160,0440.1%–

13Clay County, IAIA16,2020.0%–

14Jones County, IAIA21,2530.0%–

15Cerro Gordo County, IAIA42,3720.0%–

16Jasper County, IAIA38,1530.0%–

17Sioux County, IAIA36,7740.0%–

18Dallas County, IAIA118,4570.0%–

19Polk County, IAIA516,5460.0%–

20Story County, IAIA101,2910.0%–

21Dickinson County, IAIA18,0770.0%–

22Pottawattamie County, IAIA92,9960.0%–

23Black Hawk County, IAIA131,5320.0%–

24Henry County, IAIA19,3490.0%–

25Scott County, IAIA175,2590.0%–

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UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES