| ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2020) |
|---|
| Caledonia | Standard | $115,730 |
| Cherry Valley | Standard | $78,240 |
| Davis | Standard | $69,750 |
| Davis Junction | Standard | $64,610 |
| Durand | Standard | $65,100 |
| Leaf River | Standard | $65,240 |
| Pecatonica | Standard | $69,880 |
| Rockton | Standard | $75,930 |
| Roscoe | Standard | $83,870 |
| South Beloit | Standard | $61,750 |
| Stillman Valley | Standard | $83,980 |
| Winnebago | Standard | $79,120 |
| Rockford | Standard | $37,910 |
| Rockford | Standard | $40,030 |
| Rockford | Standard | $45,940 |
| Rockford | Standard | $28,800 |
| Rockford | Standard | $70,830 |
| Rockford | Standard | $48,450 |
| Rockford | Standard | $45,610 |
| Loves Park | Standard | $57,060 |
| Rockford | Standard | $84,650 |
| Machesney Park | Standard | $52,220 |
Source: US Internal Revenue Service