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.

Japanese Americans: full group profile →

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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%

03Mahaska County, IAIA21,88086−5%

04Story County, IAIA101,29177+88%

05Scott County, IAIA175,25970+30%

06Linn County, IAIA232,02857−50%

07Black Hawk County, IAIA131,53254−31%

08Wright County, IAIA12,80148–

09Woodbury County, IAIA106,64946+207%

10Pottawattamie County, IAIA92,99640+567%

11Cherokee County, IAIA11,36939–

12Clinton County, IAIA46,00231+138%

13Winneshiek County, IAIA19,73328+133%

14Jasper County, IAIA38,15326+1200%

15Bremer County, IAIA25,29621–

16Dubuque County, IAIA99,38118−53%

17Poweshiek County, IAIA18,36817−69%

18Worth County, IAIA7,33816–

19Buena Vista County, IAIA20,44914+56%

20Sioux County, IAIA36,77414+250%

21Marion County, IAIA34,19212–

22Henry County, IAIA19,3498–

23Wapello County, IAIA35,2108+33%

24Pocahontas County, IAIA6,8197–

25Adair County, IAIA7,4035+0%

26Butler County, IAIA14,0495–

27Mills County, IAIA14,7935–

28Decatur County, IAIA7,6554–

29Dallas County, IAIA118,4574−67%

30Mitchell County, IAIA10,6503–

31Hamilton County, IAIA14,9443–

32Webster County, IAIA36,8383−87%

33Clarke County, IAIA9,5742–

34Allamakee County, IAIA14,2382–

35O'Brien County, IAIA14,2202−97%

36Grundy County, IAIA12,3611–

37Hardin County, IAIA16,4551+0%

SHOWING 1–37 OF 37

Download CSV (full list, 37 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES