| ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2020) |
|---|
| Ransom | Standard | $63,530 |
| Earlville | Standard | $56,790 |
| Leland | Standard | $64,480 |
| Newark | Standard | $82,790 |
| Sandwich | Standard | $63,040 |
| Serena | Standard | $73,870 |
| Sheridan | Standard | $66,390 |
| Somonauk | Standard | $74,260 |
| La Salle | Standard | $53,960 |
| Dana | Standard | $47,110 |
| Grand Ridge | Standard | $66,580 |
| Lostant | Standard | $65,690 |
| Marseilles | Standard | $62,870 |
| Mendota | Standard | $57,000 |
| Oglesby | Standard | $58,740 |
| Ottawa | Standard | $63,230 |
| Peru | Standard | $65,130 |
| Rutland | Standard | $51,300 |
| Seneca | Standard | $67,580 |
| Streator | Standard | $53,110 |
| Tonica | Standard | $65,260 |
| Utica | Standard | $77,510 |
| Wenona | Standard | $60,160 |
Source: US Internal Revenue Service