11 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 59601 | Helena | 31,728 |
| 59602 | Helena | 30,754 |
| 59635 | East Helena | 8,292 |
| 59639 | Lincoln | 1,021 |
| 59625 | Helena | 663 |
| 59410 | Augusta | 520 |
| 59648 | Wolf Creek | 486 |
| 59633 | Canyon Creek | 272 |
| 59640 | Marysville | 160 |
| 59636 | Fort Harrison | 32 |
| 59623 | Helena | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 11 ZCTAs in Lewis and Clark County, Montana (US Census).