Yellowstone County, MT Population By Ancestry in 2021 (ACS-5Yrs)

Updated on March 3, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 163.59K Yellowstone County, MT population, 48.26K had German ancestry (29.50%), 34.19K had Unclassified ancestry (20.90%), and 28.77K had Other Groups ancestry (17.59%).

The chart below shows the top 10 ancestry groups by percentage, and the table below shows both the population and percentages for many ancestry groups.

You can see similar information for other Montana counties, and for Montana.

NB: People could belong to one or more ancestry groups.

Data Source: US Census Bureau.
Yellowstone County, MT Percentage of Ancestry Population in 2021
German
Unclassified
Other Groups
Irish
English
Norwegian
American
Italian
French (except Basque)
Swedish
Yellowstone County, MT Population By Ancestry in 2021
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Ancestry Population Percent of Pop. (%)
German 48263 29.50
Unclassified 34186 20.90
Other Groups 28769 17.59
Irish 20418 12.48
English 18164 11.10
Norwegian 16066 9.82
American 7435 4.55
Italian 5493 3.36
French (except Basque) 4433 2.71
Swedish 4165 2.55
Scottish 3835 2.34
European 3030 1.85
Danish 2579 1.58
Polish 2567 1.57
Russian 2239 1.37
Dutch 2173 1.33
Scandinavian 2111 1.29
Scotch Irish 1918 1.17
Welsh 1072 0.66
French Canadian 1049 0.64
Finnish 1010 0.62
Czech 887 0.54
British 611 0.37
Swiss 590 0.36
Canadian 497 0.30
Northern European 481 0.29
Ukrainian 478 0.29
Subsaharan African 457 0.28
African 421 0.26
Greek 416 0.25
Hungarian 414 0.25
Serbian 391 0.24
Belgian 344 0.21
Austrian 334 0.20
Croatian 304 0.19
Portuguese 293 0.18
Yugoslavian 270 0.17
West Indian (except Hispanic groups) 208 0.13
Lithuanian 195 0.12
Eastern European 137 0.08
Slavic 128 0.08
Slovak 119 0.07
Czechoslovakian 103 0.06
Slovene 87 0.05
Basque 86 0.05
Iranian 72 0.04
Bulgarian 71 0.04
Belizean 64 0.04
Pennsylvania German 60 0.04
Jamaican 58 0.04
Arab 53 0.03
Haitian 47 0.03
West Indian 39 0.02
Lebanese 31 0.02
Nigerian 31 0.02
Luxembourger 30 0.02
Guyanese 28 0.02
Romanian 21 0.01
New Zealander 19 0.01
Brazilian 16 0.01
Icelander 15 0.01
Celtic 14 0.01
Alsatian 11 0.01
Australian 8 0.01
Turkish 6 0.00
Afghan 5 0.00
Egyptian 4 0.00
Albania 3 0.00
Moroccan 3 0.00
German Russian 3 0.00
Latvian 3 0.00
Armenian 1 0.00