| Group 1A Counties | Cook |
| DeKalb |
| DuPage |
| Kane |
| Kendall |
| Lake |
| McHenry |
| Group 1B Counties | Boone |
| Champaign |
| Kankakee |
| Madison |
| McLean |
| Monroe |
| Ogle |
| Peoria |
| Rock Island |
| Sangamon |
| St. Clair |
| Tazewell |
| Whiteside |
| Will |
| Winnebago |
| Woodford |
| Group 2 Counties | All counties not listed in Group 1A or in Group 1B. This includes: |
| Adams |
| Alexander |
| Bond |
| Brown |
| Bureau |
| Calhoun |
| Carroll |
| Cass |
| Christian |
| Clark |
| Clay |
| Clinton |
| Coles |
| Crawford |
| Cumberland |
| DeWitt |
| Douglass |
| Edgar |
| Edwards |
| Effingham |
| Fayette |
| Ford |
| Franklin |
| Fulton |
| Gallatin |
| Greene |
| Grundy |
| Hamilton |
| Hancock |
| Hardin |
| Henderson |
| Henry |
| Iroquois |
| Jackson |
| Jasper |
| Jefferson |
| Jersey |
| Jo Daviess |
| Johnson |
| Knox |
| LaSalle |
| Lawrence |
| Lee |
| Livingston |
| Logan |
| Macon |
| Macoupin |
| Marion |
| Marshall |
| Mason |
| Massac |
| McDonough |
| Menard |
| Mercer |
| Montgomery |
| Morgan |
| Moultrie |
| Perry |
| Piatt |
| Pike |
| Pope |
| Pulaski |
| Putnam |
| Randolph |
| Richland |
| Saline |
| Schuyler |
| Scott |
| Shelby |
| Stark |
| Stephenson |
| Union |
| Vermillion |
| Wabash |
| Warren |
| Washington |
| Wayne |
| White |
| Williamson |
(Source: Added at 48 Ill. Reg. 14957, effective October 1, 2024)