| Zip Code | City | Population ↓ |
|---|---|---|
| 59601 | Helena | 31,447 |
| 59602 | Helena | 29,846 |
| 59635 | East Helena | 7,815 |
| 59639 | Lincoln | 1,171 |
| 59410 | Augusta | 621 |
| 59648 | Wolf Creek | 335 |
| 59633 | Canyon Creek | 289 |
| 59625 | Helena | 155 |
| 59640 | Marysville | 67 |
| 59636 | Fort Harrison | 27 |
| 59623 | Helena | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Lewis and Clark County, Montana (US Census).