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