Boulder Hill CDP, IL Population By Ancestry in 2021 (ACS-5Yrs)

Updated on April 16, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, among the 9.68K Boulder Hill CDP, IL population, 3.12K had Unclassified ancestry (32.28%), 2.79K had Other Groups ancestry (28.82%), and 1.65K had German ancestry (17.03%).

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

You can also see similar information for other Illinois cities and places, and for Illinois.

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

Data Source: US Census Bureau.

Boulder Hill CDP, IL Percentage of Ancestry Population in 2021

Unclassified

Other Groups

German

Irish

Polish

English

Swedish

Italian

Russian

American

Boulder Hill CDP, IL Population By Ancestry in 2021

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Ancestry	Population	Percent of Pop. (%)
Unclassified	3123	32.28
Other Groups	2788	28.82
German	1648	17.03
Irish	1153	11.92
Polish	747	7.72
English	415	4.29
Swedish	244	2.52
Italian	218	2.25
Russian	209	2.16
American	205	2.12
Czech	197	2.04
Norwegian	167	1.73
Danish	156	1.61
French (except Basque)	150	1.55
Hungarian	146	1.51
Romanian	136	1.41
Scotch Irish	109	1.13
Scottish	95	0.98
Dutch	92	0.95
Lithuanian	85	0.88
European	69	0.71
Swiss	39	0.40
Luxembourger	38	0.39
West Indian (except Hispanic groups)	25	0.26
Jamaican	25	0.26
Welsh	20	0.21
Ukrainian	19	0.20
Eastern European	17	0.18
Latvian	17	0.18
Finnish	13	0.13
Austrian	8	0.08
Croatian	8	0.08
Yugoslavian	8	0.08
Scandinavian	6	0.06
Slovak	6	0.06