RANKING · 2020 CENSUS · 25 SHOWN OF 25

Largest Australian population, Iowa counties · 2020

Iowa counties ranked by the number of residents who are Australian ancestry, from the 2020 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. 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

Largest Australian population by state

RANKPLACESTATEPOPAUSTRALIAN POPULATIONVS 2010

01Polk County, IAIA516,54682−51%

02Warren County, IAIA57,33181+98%

03Johnson County, IAIA160,04478+271%

04Muscatine County, IAIA41,85338–

05Webster County, IAIA36,83837–

06Mitchell County, IAIA10,65031–

07Emmet County, IAIA9,10727–

08Hardin County, IAIA16,45527+800%

09Clinton County, IAIA46,00226–

10Dallas County, IAIA118,45722–

11Cerro Gordo County, IAIA42,37218−61%

12Jasper County, IAIA38,15314–

13Poweshiek County, IAIA18,36814+40%

14Story County, IAIA101,29114+75%

15Lucas County, IAIA8,84711–

16Sioux County, IAIA36,77411−67%

17Decatur County, IAIA7,65510+150%

18Jones County, IAIA21,2539–

19Worth County, IAIA7,3389+80%

20Black Hawk County, IAIA131,5328–

21Clay County, IAIA16,2028+14%

22Scott County, IAIA175,2598−90%

23Pottawattamie County, IAIA92,9967−42%

24Dickinson County, IAIA18,0772–

25Henry County, IAIA19,3491−80%

SHOWING 1–25 OF 25

Download CSV (full list, 25 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS