| ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2020) |
|---|
| East Saint Louis | Standard | $28,460 |
| East Saint Louis | Standard | $30,920 |
| East Saint Louis | Standard | $24,210 |
| East Saint Louis | Standard | $28,510 |
| East Saint Louis | Standard | $28,580 |
| East Saint Louis | Standard | $26,690 |
| Fairview Heights | Standard | $59,150 |
| Belleville | Standard | $60,480 |
| Belleville | Standard | $65,770 |
| Belleville | Standard | $64,880 |
| Scott Air Force Base | Standard | $62,790 |
| Belleville | Standard | $61,770 |
| Caseyville | Standard | $70,920 |
| Collinsville | Standard | $59,830 |
| Columbia | Standard | $97,380 |
| Dupo | Standard | $48,270 |
| East Carondelet | Standard | $52,870 |
| Freeburg | Standard | $79,200 |
| Lebanon | Standard | $76,320 |
| Lenzburg | Standard | $50,530 |
| Marissa | Standard | $56,910 |
| Mascoutah | Standard | $74,120 |
| Millstadt | Standard | $84,320 |
| New Athens | Standard | $63,650 |
| New Baden | Standard | $68,320 |
| O'Fallon | Standard | $87,680 |
| Smithton | Standard | $101,210 |
| Trenton | Standard | $77,160 |
| Waterloo | Standard | $81,530 |
Source: US Internal Revenue Service