| Locality | Postal Code |
|---|---|
| Alcova, Natrona | 82620 |
| Allendale, Natrona | 82609 |
| Arminto, Natrona | 82630 |
| Bar Nunn, Natrona | 82601 |
| Casper, Natrona | 82601, 82602, 82604, 82605, 82609 |
| Edgerton, Natrona | 82635 |
| Evansville, Natrona | 82636 |
| Hiland, Natrona | 82638 |
| Midwest, Natrona | 82643 |
| Mills, Natrona | 82604, 82644 |
| Moneta, Natrona | 82638 |
| Natrona, Natrona | 82646 |
| Powder River, Natrona | 82648 |