RANKING · 2020 CENSUS · 18 SHOWN OF 18

Highest Dominican population share, Iowa counties · 2020

Iowa counties ranked by the share of all residents who are Dominican origin (2020 American Community Survey). A concentration measure: Dominican residents as a percentage of total population. This list covers the 18 counties in Iowa that qualify, ranked against each other statewide.

Dominican Americans: full group profile →

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RELATEDLargest Mexican population Highest Mexican population share Largest Puerto Rican population Highest Puerto Rican population share Largest Cuban population Highest Cuban population share

YEAR2010 2020 2024

RANKPLACESTATEPOPDOMINICAN SHAREVS 2010

01Marshall County, IAIA39,8900.3%–

02O'Brien County, IAIA14,2200.3%–

03Marion County, IAIA34,1920.2%–

04Plymouth County, IAIA25,6970.1%–

05Cass County, IAIA12,9600.1%–

06Palo Alto County, IAIA8,8990.1%–

07Webster County, IAIA36,8380.1%–

08Black Hawk County, IAIA131,5320.1%–

09Hardin County, IAIA16,4550.1%−0.0 pts

10Johnson County, IAIA160,0440.0%+0.0 pts

11Polk County, IAIA516,5460.0%+0.0 pts

12Linn County, IAIA232,0280.0%–

13Cerro Gordo County, IAIA42,3720.0%–

14Louisa County, IAIA10,4160.0%–

15Woodbury County, IAIA106,6490.0%+0.0 pts

16Story County, IAIA101,2910.0%−0.0 pts

17Cedar County, IAIA18,3590.0%–

18Dubuque County, IAIA99,3810.0%−0.0 pts

SHOWING 1–18 OF 18

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS