ZIP Codes in are essential for accurate and timely mail delivery. Managed by the United States Postal Service (USPS), these postal codes help identify specific regions, cities, and post offices. Typically, the first digit represents a broad region, the next two indicate a smaller geographic area, and the final two digits identify specific delivery zones or post offices within .
| Post Office | Cheyenne |
| Division | Laramie |
| Pincode | 82001 |
| Post Office | Cheyenne |
| Division | Laramie |
| Pincode | 82009 |
| Post Office | Rock Springs |
| Division | Sweetwater |
| Pincode | 82901 |
| Post Office | Casper |
| Division | Natrona |
| Pincode | 82604 |
| Post Office | Casper |
| Division | Natrona |
| Pincode | 82601 |
| Post Office | Gillette |
| Division | Campbell |
| Pincode | 82718 |