| Item | Obligations |
|---|---|
| Department of Defense | $4.6B |
| Department of Energy | $1.8B |
| Department of Veterans Affairs | $1.6B |
| General Services Administration | $417M |
| Department of Health and Human Services | $187M |
| Department of Agriculture | $175M |
| Department of Justice | $86M |
| Department of Homeland Security | $72.1M |
| Department of Labor | $34.2M |
| Department of Transportation | $29.7M |
Department of Defense was the top federal buyer in Illinois, obligating $4.6B (50.1% of the state total).