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ZIP Code 59403 – Great Falls, MT

Great Falls, Montana · Cascade County · Mountain time

ZIP code59403
CityGreat Falls
StateMontana
CountyCascade County
Area code406
PopulationNot published (no Census ZIP area)
Time zoneMountain · local time
ZIP typePO box or unique ZIP (no Census area)
Center (lat, long)47.5002, -111.3008

Map

Nearby ZIP codes

59402 Malmstrom Afb · 0 mi59401 Great Falls · 1.3 mi59414 Black Eagle · 2.7 mi59406 Great Falls · 8.7 mi59404 Great Falls · 9.2 mi59472 Sand Coulee · 12 mi59485 Ulm · 13.3 mi59405 Great Falls · 14.6 mi

About ZIP 59403

ZIP code 59403 is assigned to Great Falls, Montana. It lies in Cascade County. It is a PO-box-only or single-address ZIP, so the Census Bureau does not publish an area for it; the location shown is approximate. The closest neighboring ZIP is 59402 (Malmstrom Afb), about 0 miles away.

Every address in 59403 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources