| City: | Mount Washington, New Hampshire |
| City Alias: | Mt Washington |
| County: | Coos County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 8:46:48 PM |
| Population: | No Population Data |
| Area Code: | 603 |
| Classification: | PO Box |
| Coordinates: | 44.2855, -71.2979 |
| Quick Link: |
Mount Washington, New Hampshire (ZIP 03589) serves the summit area of the Northeast's highest peak. This isn't a residential community. Zero people live here permanently. The ZIP exists to provide mail service to Mount Washington Observatory, the state park facilities, and the summit's weather research station.
Mail delivery uses a single highway contract route serving Base Station Road. The three delivery points with unit designators handle packages, scientific equipment, and correspondence for the rotating crews who staff the summit facilities. Despite being classified as a PO Box ZIP, this location maintains no actual PO Boxes. The community post office operates seasonally, coordinating with the Mount Washington Auto Road and Cog Railway access.
The 6.25 square mile service area covers the summit zone and upper slopes. Mount Washington is famous for extreme weather, including the highest wind speed ever recorded by a surface weather station (231 mph in 1934). Mail delivery depends entirely on highway contract carriers who can navigate the challenging access roads when conditions permit.
Single access road serving summit facilities with unit-based addressing for different operational areas.
ZIP Code 03589 is designated for PO Box delivery only; business establishment and employment data are not available. USPS data shows 0 residential mailboxes and 1 business mailboxes, reflecting local delivery coverage.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 1Source: USPS |
| Total Delivery Receptacles: | 38Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 03589 is located in Coos County, New Hampshire, within the Metropolitan Statistical Area (CBSA ) and New Hampshire's 2nd Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 03589. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | --Source: Census |
| CBSA Number: | --Source: Census |
| CBSA Type: | --Source: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 0Source: Census |
| MSA: | Source: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 02Source: USPS |
| Congressional Land Area: | 6489 sq miSource: Census |
| PMSA: | Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | --Source: Census |
| Place Name: | --Source: Census |
We could not locate which school district 03589 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.