RANKING · 2020 CENSUS · 18 SHOWN OF 18

Largest Dominican population, Iowa counties · 2020

Iowa counties ranked by the number of residents who are Dominican origin, 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 18 counties in Iowa that qualify, ranked against each other statewide. The median across all 18 is 32.

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 POPULATIONVS 2010

01Polk County, IAIA516,546193+233%

02Marshall County, IAIA39,890110–

03Black Hawk County, IAIA131,532109–

04Linn County, IAIA232,02874–

05Johnson County, IAIA160,04468+278%

06Marion County, IAIA34,19253–

07O'Brien County, IAIA14,22037–

08Plymouth County, IAIA25,69735–

09Webster County, IAIA36,83832–

10Woodbury County, IAIA106,64917+13%

11Cass County, IAIA12,96014–

12Hardin County, IAIA16,45512−14%

13Story County, IAIA101,29112−57%

14Dubuque County, IAIA99,38110−55%

15Palo Alto County, IAIA8,8999–

16Cerro Gordo County, IAIA42,3728–

17Cedar County, IAIA18,3592–

18Louisa County, IAIA10,4162–

SHOWING 1–18 OF 18

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