| Post Office | O Fallon |
| Division | Saint Clair |
| Pincode | 62269 |
| Post Office | Belleville |
| Division | Saint Clair |
| Pincode | 62221 |
| Post Office | Belleville |
| Division | Saint Clair |
| Pincode | 62226 |
| Post Office | Belleville |
| Division | Saint Clair |
| Pincode | 62220 |
| Post Office | Belleville |
| Division | Saint Clair |
| Pincode | 62223 |
| Post Office | Fairview Heights |
| Division | Saint Clair |
| Pincode | 62208 |
| Post Office | East Saint Louis |
| Division | Saint Clair |
| Pincode | 62206 |
| Post Office | Mascoutah |
| Division | Saint Clair |
| Pincode | 62258 |
| Post Office | East Saint Louis |
| Division | Saint Clair |
| Pincode | 62207 |
20 City in Saint Clair | List of Zip Codes Location In Illinois and Your selected County Saint Clair