Knox County ZIP Codes
Knox County is a county of Maine.
- ZIP codes
- 20
- Cities & towns
- 20
- Area codes
- 1
- Land area
- 365 sq mi
Every ZIP code in Knox County
| ZIP code | City |
|---|---|
| 04547 | Friendship |
| 04563 | Cushing |
| 04574 | Washington |
| 04645 | Isle Au Haut |
| 04841 | Rockland |
| 04843 | Camden |
| 04847 | Hope |
| 04851 | Matinicus |
| 04853 | North Haven |
| 04854 | Owls Head |
| 04855 | Port Clyde |
| 04856 | Rockport |
| 04858 | South Thomaston |
| 04859 | Spruce Head |
| 04860 | Tenants Harbor |
| 04861 | Thomaston |
| 04862 | Union |
| 04863 | Vinalhaven |
| 04864 | Warren |
| 04865 | West Rockport |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Knox County codes above are listed without a column we would have to invent.
Cities and towns in Knox County
A further 19 places in Knox County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering Knox County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Knox County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Knox County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.