11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 59601 | Helena | 31,822 |
| 59602 | Helena | 30,379 |
| 59635 | East Helena | 8,382 |
| 59639 | Lincoln | 993 |
| 59410 | Augusta | 617 |
| 59648 | Wolf Creek | 468 |
| 59633 | Canyon Creek | 288 |
| 59625 | Helena | 156 |
| 59640 | Marysville | 105 |
| 59636 | Fort Harrison | 29 |
| 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).