Illinois Census Data Comparison Tool

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Ranking Counties by Diversity Index (last updated July 1, 2024)

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 83.4
2. Kane County 78.4
3. Lake County 75.9
4. Will County 72.0
5. Kendall County 69.9
6. Boone County 67.7
7. DuPage County 67.7
8. Winnebago County 66.4
9. Cass County 65.6
10. Champaign County 65.1
11. Rock Island County 61.8
12. St. Clair County 60.4
13. DeKalb County 60.1
14. Kankakee County 59.9
15. Peoria County 57.6
16. Pulaski County 56.4
17. McHenry County 54.9
18. Alexander County 52.9
19. Jackson County 52.4
20. McLean County 48.4

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Illinois Census Data Comparison Tool

Compare Illinois July 1, 2024 Data
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