Clark

County in Illinois

County

The population development of Clark.

Name	Status	Population Census 1990-04-01	Population Census 2000-04-01	Population Census 2010-04-01	Population Census 2020-04-01	Population Estimate 2024-07-01
Clark	County	15,921	17,008	16,335	15,481	15,076	→
Illinois	State	11,430,602	12,419,293	12,830,632	12,821,814	12,710,158

Contents: Incorporated Places

The population development of the incorporated places in Clark.

The Details icon links to further information about a selected place including its population structure (gender, age groups, age distribution, urbanization, »race«, ethnicity).

Name	Status	County	Population Census 1990-04-01	Population Census 2000-04-01	Population Census 2010-04-01	Population Census 2020-04-01	Population Estimate 2024-07-01
Casey	City	Clark / Cumberland	2,916	2,943	2,784	2,438	2,376	→
Marshall	City	Clark	3,626	3,979	3,950	3,960	3,865	→
Martinsville	City	Clark	1,215	1,218	1,166	1,115	1,083	→
Westfield	Village	Clark	676	678	601	536	520	→

Source: U.S. Census Bureau.

Explanation: Latest available rebased population figures are used. In case of significant changes, they were recalculated by using census block data.

Further information about the population structure:

Gender (C 2020)
Males	7,663
Females	7,792

Age Groups (C 2020)
0-17 years	3,462
18-64 years	8,757
65+ years	3,236

Age Distribution (C 2020)
80+ years	809
70-79 years	1,426
60-69 years	2,145
50-59 years	2,177
40-49 years	1,812
30-39 years	1,774
20-29 years	1,526
10-19 years	1,926
0-9 years	1,860

Urbanization (C 2020)
Rural	15,455

»Race« (C 2020)
White	14,784
Black/African American	54
Indigenous	28
Asian	60
Some other	99
2 or more	430

Ethnicity (C 2020)
Hispanic or Latino	246
Other	15,209