RANKING · 2024 ACS · 26 SHOWN OF 26

Largest Australian population, Iowa counties

Iowa counties ranked by the number of residents who are Australian ancestry, from the 2024 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 26 counties in Iowa that qualify, ranked against each other statewide. The median across all 26 is 14. Biggest climber in the top 100 since 2020: Scott County, IA, up 20 places to #2.

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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

Largest Australian population by state

RANKPLACESTATEPOPAUSTRALIAN POPULATIONVS 2010

01Polk County, IAIA516,54681−51%

02▲20Scott County, IAIA175,25977−6%

03▲20Pottawattamie County, IAIA92,99646+283%

04Des Moines County, IAIA38,07742+223%

05Marshall County, IAIA39,89042–

06Marion County, IAIA34,19238+443%

07▼4Johnson County, IAIA160,04427+29%

08▼4Muscatine County, IAIA41,85327–

09Dubuque County, IAIA99,38124–

10Plymouth County, IAIA25,69719–

11▲10Clay County, IAIA16,20216+129%

12Poweshiek County, IAIA18,36815+50%

13Jasper County, IAIA38,15314–

14Linn County, IAIA232,02814−36%

15▼9Mitchell County, IAIA10,65010–

16O'Brien County, IAIA14,2209−88%

17▼3Story County, IAIA101,2919+13%

18Wapello County, IAIA35,2107−36%

19Franklin County, IAIA9,8686−50%

20▼3Decatur County, IAIA7,6555+25%

21Boone County, IAIA26,7995–

22▲3Henry County, IAIA19,34950%

23Grundy County, IAIA12,3614–

24Washington County, IAIA22,6672–

25Mills County, IAIA14,7931–

26Winnebago County, IAIA10,2511–

SHOWING 1–26 OF 26

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES