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 (2020 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.

Australian Americans: full group profile →

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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 2010

01Mitchell County, IAIA10,6500.3%–

02Emmet County, IAIA9,1070.3%–

03Hardin County, IAIA16,4550.2%+0.1 pts

04Warren County, IAIA57,3310.2%+0.1 pts

05Lucas County, IAIA8,8470.1%–

06Decatur County, IAIA7,6550.1%+0.1 pts

07Worth County, IAIA7,3380.1%+0.1 pts

08Webster County, IAIA36,8380.1%–

09Muscatine County, IAIA41,8530.1%–

10Poweshiek County, IAIA18,3680.1%+0.0 pts

11Clinton County, IAIA46,0020.1%–

12Johnson County, IAIA160,0440.1%+0.0 pts

13Clay County, IAIA16,2020.0%+0.0 pts

14Jones County, IAIA21,2530.0%–

15Cerro Gordo County, IAIA42,3720.0%−0.1 pts

16Jasper County, IAIA38,1530.0%–

17Sioux County, IAIA36,7740.0%−0.1 pts

18Dallas County, IAIA118,4570.0%–

19Polk County, IAIA516,5460.0%−0.0 pts

20Story County, IAIA101,2910.0%+0.0 pts

21Dickinson County, IAIA18,0770.0%–

22Pottawattamie County, IAIA92,9960.0%−0.0 pts

23Black Hawk County, IAIA131,5320.0%–

24Henry County, IAIA19,3490.0%−0.0 pts

25Scott County, IAIA175,2590.0%−0.0 pts

SHOWING 1–25 OF 25

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS