Montana ZIP codes
Montana holds 404 ZIP codes between 59001 and 59937. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Montana
| Place | ZIP codes |
|---|---|
| Billings | 14 |
| Helena | 8 |
| Missoula | 8 |
| Bozeman | 6 |
| Great Falls | 5 |
| Butte | 5 |
| Kalispell | 3 |
| Roundup | 2 |
| Ashland | 2 |
| Dell | 1 |
| Dillon | 1 |
| Glen | 1 |
| Jackson | 1 |
| Lima | 1 |
| Polaris | 1 |
| Wisdom | 1 |
| Wise River | 1 |
| Busby | 1 |
| Crow Agency | 1 |
| Decker | 1 |
Montana counties by ZIP count
| County | ZIP codes |
|---|---|
| Yellowstone | 23 |
| Cascade | 18 |
| Flathead | 18 |
| Missoula | 16 |
| Lewis and Clark | 15 |
| Gallatin | 13 |
| Lake | 12 |
| Madison | 11 |
| Rosebud | 11 |
| Valley | 11 |
Reading a Montana ZIP code
Montana holds 404 ZIP codes between 59001 and 59937, spread over 56 counties. Billings leads the state with 14 codes, ahead of Helena with 8. Every code here opens with the digit 5: that opening number is the national postal region Montana belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Billings spreads across 14 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Montana; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources