| Locality | Post Code |
|---|---|
| Acton, Yellowstone | 59002 |
| Ballantine, Yellowstone | 59006 |
| Billings, Yellowstone | 59101, 59102, 59104, 59105, 59106 |
| Broadview, Yellowstone | 59015 |
| Comanche, Yellowstone | 59015 |
| Custer, Yellowstone | 59024 |
| Hesper, Yellowstone | 59102 |
| Huntley, Yellowstone | 59037 |
| Laurel, Yellowstone | 59044 |
| Lockwood, Yellowstone | 59101 |
| Molt, Yellowstone | 59057 |
| Pompeys Pillar, Yellowstone | 59064 |
| Shepherd, Yellowstone | 59079 |
| Worden, Yellowstone | 59088 |