| ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
|---|
| Galesburg | Standard | $447,470 |
| Abingdon | Standard | $402,050 |
| Altona | Standard | $188,340 |
| Dahinda | Standard | $365,060 |
| East Galesburg | Standard | $227,120 |
| Galva | Standard | $364,060 |
| Gilson | Standard | $174,990 |
| Knoxville | Standard | $333,640 |
| La Fayette | Standard | $153,870 |
| Maquon | Standard | $146,550 |
| Oneida | Standard | $157,600 |
| Rio | Standard | $149,210 |
| Saint Augustine | Standard | $179,200 |
| Victoria | Standard | $172,130 |
| Wataga | Standard | $184,860 |
| Williamsfield | Standard | $147,710 |
| Elmwood | Standard | $324,700 |
| London Mills | Standard | $144,540 |
| Yates City | Standard | $152,810 |
Source: US Internal Revenue Service