| City: | Kalispell, Montana |
| County: | Flathead County |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 7:01:30 AM |
| Population: | No Population Data |
| Area Code: | 406 |
| Classification: | PO Box |
| Coordinates: | 48.1956, -114.3117 |
| Quick Link: |
ZIP code 59903 doesn't cover a separate town. It's a point location within Kalispell, Montana, representing a downtown post office that serves PO Box customers and businesses. The actual Kalispell community uses ZIP 59901, which entirely surrounds this location. With 1,030 PO Boxes and 642 business delivery points, 59903 functions as a commercial mail hub rather than a residential area.
The post office sits along 1st Avenue West, the historic main street of downtown Kalispell. US Highway 2, which runs east from the location, connects Kalispell to Glacier National Park about 30 miles away. Both addresses appear in the ZIP+4 data, with 153 records on 1st Ave W and 31 on US Highway 2 E. All street delivery uses city carrier routes.
Residents and tourists in Kalispell get their mail through ZIP 59901, the standard sibling ZIP that covers the actual community. The 59903 ZIP exists primarily for businesses and individuals who prefer a downtown PO Box address. Flathead County residents can choose between street delivery through 59901 or a PO Box at this downtown location.
Street addresses concentrate on downtown 1st Avenue and the US Highway 2 corridor leading east toward Glacier National Park.
ZIP Code 59903 supports both business and residential activity. According to the Business Census (2024), there are 44 business establishments, employing about 357 people with an annual payroll of $19,186,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 13,952Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 44Source: CBP |
| 1st Quarter Payroll: | $4,331,000Source: CBP |
| Annual Payroll: | $19,186,000Source: CBP |
| # of Employees: | 357Source: CBP |
ZIP Code 59903 is located in Flathead County, Montana, within the Kalispell, MT Metropolitan Statistical Area (CBSA 28060) and Montana's 1st Congressional District. This Micro area has a population of 90,928 people, about 0.00% of whom live in ZIP Code 59903. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Kalispell, MTSource: Census |
| CBSA Number: | 28060Source: Census |
| CBSA Type: | MicroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 90,928Source: Census |
| MSA: | Source: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 01Source: USPS |
| Congressional Land Area: | 0 sq miSource: Census |
| PMSA: | Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 3040075Source: Census |
| Place Name: | Kalispell city; MontanaSource: Census |
We could not locate which school district 59903 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.