RANKING · 2020 CENSUS · 21 SHOWN OF 21

Highest South American population share, Montana counties · 2020

Montana counties ranked by the share of all residents who are South American origin (2023 American Community Survey). A concentration measure: South American residents as a percentage of total population. This list covers the 21 counties in Montana that qualify, ranked against each other statewide.

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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

RANKPLACESTATEPOPSOUTH AMERICAN SHAREVS 2000

01Jefferson County, MTMT13,3291.3%–

02Madison County, MTMT10,0261.1%–

03Golden Valley County, MTMT8441.1%–

04Granite County, MTMT3,6581.1%–

05Park County, MTMT18,2140.5%–

06Missoula County, MTMT123,5130.3%–

07Dawson County, MTMT8,6920.3%–

08Ravalli County, MTMT48,5820.3%–

09Toole County, MTMT5,2110.3%–

10Yellowstone County, MTMT172,6920.3%–

11Gallatin County, MTMT128,7400.2%–

12Lewis and Clark County, MTMT75,3310.2%–

13Carbon County, MTMT11,4660.2%–

14Flathead County, MTMT115,4290.2%–

15Cascade County, MTMT85,0290.1%–

16Beaverhead County, MTMT10,0430.1%–

17Roosevelt County, MTMT10,2420.1%–

18Lake County, MTMT33,3920.1%–

19Chouteau County, MTMT5,8650.1%–

20Lincoln County, MTMT22,3280.0%–

21Fergus County, MTMT11,8250.0%–

SHOWING 1–21 OF 21

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UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES