RANKING · 2020 CENSUS · 35 SHOWN OF 35

Highest Japanese population share, Iowa counties · 2020

Iowa counties ranked by the share of all residents who are Japanese (2020 American Community Survey). A concentration measure: Japanese residents as a percentage of total population. This list covers the 35 counties in Iowa that qualify, ranked against each other statewide. The median across all 35 is 0.1%.

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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 SHAREVS –

01O'Brien County, IAIA14,2200.5%–

02Mahaska County, IAIA21,8800.4%–

03Adams County, IAIA3,6170.4%–

04Page County, IAIA14,8560.4%–

05Poweshiek County, IAIA18,3680.3%–

06Union County, IAIA11,8290.3%–

07Johnson County, IAIA160,0440.2%–

08Howard County, IAIA9,4150.2%–

09Floyd County, IAIA14,9010.2%–

10Taylor County, IAIA5,8350.1%–

11Clayton County, IAIA16,8450.1%–

12Adair County, IAIA7,4030.1%–

13Webster County, IAIA36,8380.1%–

14Polk County, IAIA516,5460.1%–

15Winneshiek County, IAIA19,7330.1%–

16Black Hawk County, IAIA131,5320.1%–

17Tama County, IAIA16,7960.1%–

18Jackson County, IAIA19,2880.1%–

19Linn County, IAIA232,0280.1%–

20Buena Vista County, IAIA20,4490.0%–

21Greene County, IAIA8,6580.0%–

22Story County, IAIA101,2910.0%–

23Dubuque County, IAIA99,3810.0%–

24Scott County, IAIA175,2590.0%–

25Clinton County, IAIA46,0020.0%–

26Muscatine County, IAIA41,8530.0%–

27Wapello County, IAIA35,2100.0%–

28Woodbury County, IAIA106,6490.0%–

29Dallas County, IAIA118,4570.0%–

30Lee County, IAIA32,3060.0%–

31Sioux County, IAIA36,7740.0%–

32Pottawattamie County, IAIA92,9960.0%–

33Hardin County, IAIA16,4550.0%–

34Jefferson County, IAIA15,2910.0%–

35Jasper County, IAIA38,1530.0%–

SHOWING 1–35 OF 35

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