| Locality | Post Code |
|---|---|
| Clark, Park | 82435 |
| Cody, Park | 82414 |
| Frannie, Park | 82423 |
| Garland, Park | 82435 |
| Mammoth, Park | 82190 |
| Mammoth Hot Springs, Park | 82190 |
| Mantua, Park | 82435 |
| Meeteetse, Park | 82433 |
| Odonnell Spur, Park | 82435 |
| Powell, Park | 82435 |
| Ralston, Park | 82440 |
| Wapiti, Park | 82450 |
| Willwood, Park | 82435 |
| Yellowstone National Park, Park | 82190 |