Boulder Montana ZIP Codes
Boulder holds a single ZIP code.
Every ZIP code in Boulder
| ZIP code | County |
|---|---|
| 59632 | Jefferson County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Boulder codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Boulder. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Boulder ZIP code begins 596. Those first three digits identify the sectional center facility that processes mail for this part of Montana. Statewide that range covers 24 ZIP codes, so Boulder accounts for 4% of it.
Every Montana ZIP prefix and the region it covers →
Area codes covering Boulder
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Boulder occupies.
Boulder Montana area codes in full →
Where Boulder's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Boulder
| City | Distance | ZIP codes |
|---|---|---|
| Whitehall Montana ZIP codes | 25 mi | 1 ZIP code |
| Helena Montana ZIP codes | 25 mi | 8 ZIP codes |
| East Helena Montana ZIP codes | 26 mi | 1 ZIP code |
| Townsend Montana ZIP codes | 29 mi | 1 ZIP code |
| Butte Montana ZIP codes | 31 mi | 5 ZIP codes |
| Deer Lodge Montana ZIP codes | 31 mi | 1 ZIP code |
| Three Forks Montana ZIP codes | 36 mi | 1 ZIP code |
| Manhattan Montana ZIP codes | 46 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.