Illinois Census Data Comparison Tool

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Ranking Counties by Diversity Index (last updated July 1, 2021)

There are 20 records sorted in descending order.

The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


County Diversity Index
1. Cook County 78.6
2. Kane County 70.5
3. Lake County 67.1
4. Will County 63.3
5. Kendall County 58.9
6. DuPage County 58.8
7. Winnebago County 58.5
8. Boone County 57.7
9. Champaign County 56.1
10. St. Clair County 55.4
11. Cass County 54.8
12. Pulaski County 54.4
13. Rock Island County 54.4
14. Alexander County 54.3
15. Kankakee County 51.9
16. Peoria County 51.7
17. Brown County 48.8
18. DeKalb County 47.6
19. Jackson County 45.7
20. McHenry County 43.1

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Illinois Census Data Comparison Tool

Compare Illinois July 1, 2021 Data
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