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 (2023 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.

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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

01Marion County, IAIA34,1920.1%–

02Des Moines County, IAIA38,0770.1%–

03Marshall County, IAIA39,8900.1%–

04Clay County, IAIA16,2020.1%–

05Mitchell County, IAIA10,6500.1%–

06Poweshiek County, IAIA18,3680.1%–

07Plymouth County, IAIA25,6970.1%–

08Decatur County, IAIA7,6550.1%–

09O'Brien County, IAIA14,2200.1%–

10Muscatine County, IAIA41,8530.1%–

11Franklin County, IAIA9,8680.1%–

12Pottawattamie County, IAIA92,9960.0%–

13Scott County, IAIA175,2590.0%–

14Jasper County, IAIA38,1530.0%–

15Grundy County, IAIA12,3610.0%–

16Henry County, IAIA19,3490.0%–

17Dubuque County, IAIA99,3810.0%–

18Wapello County, IAIA35,2100.0%–

19Boone County, IAIA26,7990.0%–

20Johnson County, IAIA160,0440.0%–

21Polk County, IAIA516,5460.0%–

22Winnebago County, IAIA10,2510.0%–

23Story County, IAIA101,2910.0%–

24Washington County, IAIA22,6670.0%–

25Mills County, IAIA14,7930.0%–

26Linn County, IAIA232,0280.0%–

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