Lewis and Clark County, Montana ZIP codes
15 ZIP codes are in Lewis and Clark County, plus 1 that cross in from neighboring counties. It's part of the Helena, MT metro area.
- ZIP codes
- 15
- Population in these ZIPs
- 73,928
- Avg. median income
- $81,900population-weighted
- Cities & towns
- 8
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Lewis and Clark County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 59410 | Augusta | 520 | $42,321 | $313,700 |
| 59601 | Helena | 31,728 | $72,290 | $439,900 |
| 59602 | Helena | 30,754 | $92,985 | $530,000 |
| 59604 PO Box | Helena | — | — | — |
| 59620 PO Box | Helena | — | — | — |
| 59623 | Helena | 0 | — | — |
| 59624 PO Box | Helena | — | — | — |
| 59625 | Helena | 663 | — | — |
| 59626 PO Box | Helena | — | — | — |
| 59633 | Canyon Creek | 272 | — | $504,500 |
| 59635 | East Helena | 8,292 | $83,740 | $434,600 |
| 59636 | Fort Harrison | 32 | — | — |
| 59639 | Lincoln | 1,021 | $57,778 | $364,100 |
| 59640 | Marysville | 160 | $99,167 | $287,500 |
| 59648 | Wolf Creek | 486 | $65,750 | $467,800 |
ZIP codes partly in Lewis and Clark County
These ZIP codes are mostly in a neighboring county but cover part of Lewis and Clark County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 59421 | Cascade | Cascade County | 2,069 | $78,125 | $398,700 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Lewis and Clark County
Nearby counties
Frequently asked questions
How many ZIP codes are in Lewis and Clark County, Montana?
15 ZIP codes are mainly in Lewis and Clark County, and 1 more ZIP codes from neighboring areas reach partly into it.
What cities are in Lewis and Clark County?
ZIP codes in Lewis and Clark County use the city names Augusta, Canyon Creek, East Helena, Fort Harrison, Helena, Lincoln, Marysville and Wolf Creek.
What metro area is Lewis and Clark County in?
Lewis and Clark County is part of the Helena, MT metropolitan statistical area.