| Zip Code | City | Population ↓ |
|---|---|---|
| 59102 | Billings | 47,977 |
| 59101 | Billings | 42,250 |
| 59105 | Billings | 35,480 |
| 59106 | Billings | 21,417 |
| 59044 | Laurel | 12,302 |
| 59079 | Shepherd | 3,940 |
| 59037 | Huntley | 2,336 |
| 59088 | Worden | 1,265 |
| 59006 | Ballantine | 586 |
| 59015 | Broadview | 394 |
| 59024 | Custer | 335 |
| 59002 | Acton | 221 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 12 ZCTAs in Yellowstone County, Montana (US Census).