RANKING · 2024 ACS · 37 SHOWN OF 37

Largest Japanese population, Iowa counties

Iowa counties ranked by the number of residents who are Japanese, 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 37 counties in Iowa that qualify, ranked against each other statewide. The median across all 37 is 14. Biggest climber in the top 100 since 2020: Jasper County, IA, up 19 places to #14.

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SAME RANKING BYCities States Metros

RELATEDLargest Chinese population Highest Chinese population share Largest Taiwanese population Highest Taiwanese population share Largest Hmong population Highest Hmong population share

RANKPLACESTATEPOPJAPANESE POPULATIONVS 2020

01Polk County, IAIA516,546178−42%

02Johnson County, IAIA160,044158−41%

03▲1Mahaska County, IAIA21,88086−5%

04▲6Story County, IAIA101,29177+88%

05▲4Scott County, IAIA175,25970+30%

06▼3Linn County, IAIA232,02857−50%

07▼2Black Hawk County, IAIA131,53254−31%

08Wright County, IAIA12,80148–

09▲8Woodbury County, IAIA106,64946+207%

10▲17Pottawattamie County, IAIA92,99640+567%

11Cherokee County, IAIA11,36939–

12▲7Clinton County, IAIA46,00231+138%

13▲8Winneshiek County, IAIA19,73328+133%

14▲19Jasper County, IAIA38,15326+1200%

15Bremer County, IAIA25,29621–

16▼5Dubuque County, IAIA99,38118−53%

17▼9Poweshiek County, IAIA18,36817−69%

18Worth County, IAIA7,33816–

19▲7Buena Vista County, IAIA20,44914+56%

20▲12Sioux County, IAIA36,77414+250%

21Marion County, IAIA34,19212–

22Henry County, IAIA19,3498–

23▲5Wapello County, IAIA35,2108+33%

24Pocahontas County, IAIA6,8197–

25▲4Adair County, IAIA7,40350%

26Butler County, IAIA14,0495–

27Mills County, IAIA14,7935–

28Decatur County, IAIA7,6554–

29▼9Dallas County, IAIA118,4574−67%

30Mitchell County, IAIA10,6503–

31Hamilton County, IAIA14,9443–

32▼18Webster County, IAIA36,8383−87%

33Clarke County, IAIA9,5742–

34Allamakee County, IAIA14,2382–

35▼29O'Brien County, IAIA14,2202−97%

36Grundy County, IAIA12,3611–

37▼3Hardin County, IAIA16,45510%

SHOWING 1–37 OF 37

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