| State | State/Other Agency | Unit/Office | Total law enforcement employees | Total officers | Total civilians |
|---|---|---|---|---|---|
| State Agencies | Illinois Commerce Commission | 14 | 7 | 7 | |
| Illinois Department of Natural Resources | 177 | 161 | 16 | ||
| Secretary of State Police | District 3 | 228 | 102 | 126 | |
| Other Agencies | Burlington Northern Santa Fe Railroad | 21 | 17 | 4 | |
| Capitol Airport Authority | 4 | 4 | 0 | ||
| Chicago Fire Department | Arson Investigations | 13 | 3 | 10 | |
| Cook County Forest Preserve | 106 | 101 | 5 | ||
| Crystal Lake Park District | 3 | 3 | 0 | ||
| CSX Transportation | 20 | 20 | 0 | ||
| Decatur Park District | 5 | 5 | 0 | ||
| Du Page County Forest Preserve | 29 | 25 | 4 | ||
| Elgin, Joliet and Eastern Railway | 6 | 6 | 0 | ||
| John H. Stroger Hospital | 53 | 48 | 5 | ||
| Lake County Forest Preserve | 19 | 17 | 2 | ||
| Norfolk Southern Railway | 52 | 51 | 1 | ||
| Pekin Park District | 1 | 1 | 0 | ||
| Rockford Park District | 17 | 16 | 1 | ||
| Springfield Park District | 7 | 5 | 2 | ||
| Will County Forest Preserve | 12 | 12 | 0 |
Provides the methodology used in constructing this table and other pertinent information about this table.