| County | Black Percentage of Total Population |
| Alexander |  36 |
| Pulaski | 33 |
| St. Clair | 31 |
| Cook | 25 |
| Brown | 19 |
| Peoria | 18 |
| Macon | 17 |
| Kankakee | 16 |
| Jackson | 15 |
| Vermilion | 13 |
| Champaign | 13 |
| Winnebago | 13 |
| Sangamon | 12 |
| Will | 12 |
| Lawrence | 10 |
| Randolph | 10 |
| Stephenson | 9 |
| Rock Island | 9 |
| Jefferson | 9 |
| Perry | 9 |
| Johnson | 8 |
| Madison | 8 |
| Logan | 8 |
| Knox | 8 |
| McLean | 8 |
| Lake | 7 |
| DeKalb | 7 |
| Pope | 7 |
| Bond | 7 |
| Morgan | 6 |
| Kendall | 6 |
| Kane | 6 |
| Massac | 6 |
| McDonough | 5 |
| Livingston | 5 |
| Lee | 5 |
| DuPage | 5 |
| Crawford | 5 |
| Fayette | 5 |
| Williamson | 4 |
| Saline | 4 |
| Marion | 4 |
| Coles | 4 |
| Clinton | 4 |
| Fulton | 4 |
| Cass | 4 |
| Adams | 4 |
| Schuyler | 3 |
| Montgomery | 3 |
| Boone | 3 |
| La Salle | 2 |
| Warren | 2 |
| Pike | 2 |
| Henry | 2 |
| Whiteside | 2 |
| Christian | 2 |
| Grundy | 1 |
| McHenry | 1 |
| Tazewell | 1 |
| Union | 1 |
| Macoupin | 1 |
| Ogle | 1 |
| Menard | 1 |
| Greene | 1 |
| Iroquois | 1 |
| Carroll | 1 |
| Washington | 1 |
| Ford | 1 |
| Bureau | 1 |
| Wabash | 1 |
| De Witt | 1 |
| Woodford | 1 |
| Richland | 1 |
| Jersey | 1 |
| Jo Daviess | 1 |
| Putnam | 1 |
| Piatt | 1 |
| Clay | 1 |
| Hamilton | 1 |
| Franklin | 1 |
| Edwards | 1 |
| White | 1 |
| Edgar | 1 |
| Douglas | 1 |
| Clark | 1 |
| Stark | 1 |
| Mason | 1 |
| Hardin | 1 |
| Mercer | 0 |
| Marshall | 0 |
| Gallatin | 0 |
| Cumberland | 0 |
| Moultrie | 0 |
| Scott | 0 |
| Wayne | 0 |
| Monroe | 0 |
| Shelby | 0 |
| Effingham | 0 |
| Henderson | 0 |
| Hancock | 0 |
| Jasper | 0 |
| Calhoun | 0 |