RANKING · 2020 CENSUS · 35 SHOWN OF 35

Largest Japanese population, Iowa counties · 2020

Iowa counties ranked by the number of residents who are Japanese, 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 35 counties in Iowa that qualify, ranked against each other statewide. The median across all 35 is 14.

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 –

01Polk County, IAIA516,546305–

02Johnson County, IAIA160,044269–

03Linn County, IAIA232,028115–

04Mahaska County, IAIA21,88091–

05Black Hawk County, IAIA131,53278–

06O'Brien County, IAIA14,22063–

07Page County, IAIA14,85658–

08Poweshiek County, IAIA18,36855–

09Scott County, IAIA175,25954–

10Story County, IAIA101,29141–

11Dubuque County, IAIA99,38138–

12Union County, IAIA11,82931–

13Floyd County, IAIA14,90125–

14Webster County, IAIA36,83823–

15Clayton County, IAIA16,84518–

16Howard County, IAIA9,41516–

17Woodbury County, IAIA106,64915–

18Adams County, IAIA3,61714–

19Clinton County, IAIA46,00213–

20Dallas County, IAIA118,45712–

21Winneshiek County, IAIA19,73312–

22Jackson County, IAIA19,28811–

23Muscatine County, IAIA41,85310–

24Tama County, IAIA16,79610–

25Taylor County, IAIA5,8359–

26Buena Vista County, IAIA20,4499–

27Pottawattamie County, IAIA92,9966–

28Wapello County, IAIA35,2106–

29Adair County, IAIA7,4035–

30Greene County, IAIA8,6584–

31Lee County, IAIA32,3064–

32Sioux County, IAIA36,7744–

33Jasper County, IAIA38,1532–

34Hardin County, IAIA16,4551–

35Jefferson County, IAIA15,2911–

SHOWING 1–35 OF 35

Download CSV (full list, 35 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS