Eureka Montana ZIP Codes
Eureka holds a single ZIP code.
Every ZIP code in Eureka
| ZIP code | County |
|---|---|
| 59917 | Lincoln 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Eureka codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Eureka. 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 Eureka ZIP code begins 599. Those first three digits identify the sectional center facility that processes mail for this part of Montana. Statewide that range covers 30 ZIP codes, so Eureka accounts for 3% of it.
Every Montana ZIP prefix and the region it covers →
Area codes covering Eureka
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 Eureka occupies.
Eureka Montana area codes in full →
Where Eureka's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Eureka
| City | Distance | ZIP codes |
|---|---|---|
| Rexford Montana ZIP codes | 5.7 mi | 1 ZIP code |
| Libby Montana ZIP codes | 41 mi | 1 ZIP code |
| Whitefish Montana ZIP codes | 44 mi | 1 ZIP code |
| Troy Montana ZIP codes | 48 mi | 1 ZIP code |
| Columbia Falls Montana ZIP codes | 53 mi | 1 ZIP code |
| Kalispell Montana ZIP codes | 56 mi | 3 ZIP codes |
| Thompson Falls Montana ZIP codes | 89 mi | 1 ZIP code |
| Hot Springs Montana ZIP codes | 89 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.