| Locality | Post Code |
|---|---|
| Alorton, Saint Clair | 62207 |
| Belleville, Saint Clair | 62220, 62221, 62223, 62226 |
| Brooklyn, Saint Clair | 62059 |
| Cahokia, Saint Clair | 62206 |
| Caseyville, Saint Clair | 62232 |
| Centreville, Saint Clair | 62203, 62207 |
| Darmstadt, Saint Clair | 62255 |
| Dupo, Saint Clair | 62239 |
| East Carondelet, Saint Clair | 62240 |
| East Saint Louis, Saint Clair | 62201, 62203, 62204, 62205, 62206, … |
| Fairmont City, Saint Clair | 62201 |
| Fairview Heights, Saint Clair | 62208 |
| Fayetteville, Saint Clair | 62258 |
| Freeburg, Saint Clair | 62243 |
| Hollywood Heights, Saint Clair | 62232 |
| Imbs, Saint Clair | 62240 |
| Lebanon, Saint Clair | 62254 |
| Lenzburg, Saint Clair | 62255 |
| Lovejoy, Saint Clair | 62059 |
| Marissa, Saint Clair | 62257 |
| Mascoutah, Saint Clair | 62258 |
| Millstadt, Saint Clair | 62260 |
| National Stock Yards, Saint Clair | 62071 |
| New Athens, Saint Clair | 62264 |
| O Fallon, Saint Clair | 62269 |
| Rentchler, Saint Clair | 62221 |