RANKING · 2024 ACS · 26 SHOWN OF 26

Highest Australian population share, Iowa counties

Iowa counties ranked by the share of all residents who are Australian ancestry (2024 American Community Survey). A concentration measure: Australian residents as a percentage of total population. This list covers the 26 counties in Iowa that qualify, ranked against each other statewide.

Australian Americans: full group profile →

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SAME RANKING BYCities States Metros

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

01Marion County, IAIA34,1920.1%+0.1 pts

02Des Moines County, IAIA38,0770.1%+0.1 pts

03Marshall County, IAIA39,8900.1%–

04Clay County, IAIA16,2020.1%+0.1 pts

05Mitchell County, IAIA10,6500.1%–

06Poweshiek County, IAIA18,3680.1%+0.0 pts

07Plymouth County, IAIA25,6970.1%–

08Decatur County, IAIA7,6550.1%+0.0 pts

09O'Brien County, IAIA14,2200.1%−0.5 pts

10Muscatine County, IAIA41,8530.1%–

11Franklin County, IAIA9,8680.1%−0.1 pts

12Pottawattamie County, IAIA92,9960.0%+0.0 pts

13Scott County, IAIA175,2590.0%−0.0 pts

14Jasper County, IAIA38,1530.0%–

15Grundy County, IAIA12,3610.0%–

16Henry County, IAIA19,3490.0%+0.0 pts

17Dubuque County, IAIA99,3810.0%–

18Wapello County, IAIA35,2100.0%−0.0 pts

19Boone County, IAIA26,7990.0%–

20Johnson County, IAIA160,0440.0%+0.0 pts

21Polk County, IAIA516,5460.0%−0.0 pts

22Winnebago County, IAIA10,2510.0%–

23Story County, IAIA101,2910.0%−0.0 pts

24Washington County, IAIA22,6670.0%–

25Mills County, IAIA14,7930.0%–

26Linn County, IAIA232,0280.0%−0.0 pts

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES