Zip Code | City | Population |
|---|---|---|
| 62040 | Granite City | 40,716 |
| 62025 | Edwardsville | 35,947 |
| 62234 | Collinsville | 32,491 |
| 62002 | Alton | 30,166 |
| 62249 | Highland | 16,649 |
| 62035 | Godfrey | 16,172 |
| 62294 | Troy | 15,289 |
| 62034 | Glen Carbon | 14,497 |
| 62010 | Bethalto | 11,133 |
| 62095 | Wood River | 10,801 |
| 62024 | East Alton | 9,350 |
| 62062 | Maryville | 8,461 |
| 62060 | Madison | 3,534 |
| 62018 | Cottage Hills | 2,954 |
| 62281 | Saint Jacob | 2,811 |
| 62097 | Worden | 2,723 |
| 62087 | South Roxana | 2,121 |
| 62067 | Moro | 2,106 |
| 62001 | Alhambra | 1,766 |
| 62061 | Marine | 1,672 |
| 62048 | Hartford | 1,626 |
| 62084 | Roxana | 1,601 |
| 62074 | New Douglas | 1,213 |
| 62026 | Edwardsville | 1,054 |
| 62090 | Venice | 1,053 |
| 62021 | Dorsey | 925 |
| 62046 | Hamel | 919 |
| 62058 | Livingston | 770 |