Washington County ZIP Codes
Washington County is a county of Minnesota.
- ZIP codes
- 18
- Cities & towns
- 14
- Area codes
- 4
- Land area
- 385 sq mi
Every ZIP code in Washington County
| ZIP code | City |
|---|---|
| 55001 | Afton |
| 55003 | Bayport |
| 55016 | Cottage Grove |
| 55025 | Forest Lake |
| 55038 | Hugo |
| 55042 | Lake Elmo |
| 55043 | Lakeland |
| 55047 | Marine On Saint Croix |
| 55055 | Newport |
| 55071 | Saint Paul Park |
| 55073 | Scandia |
| 55082 | Stillwater |
| 55083 | Stillwater |
| 55090 | Willernie |
| 55115 | Saint Paul |
| 55125 | Saint Paul |
| 55128 | Saint Paul |
| 55129 | Saint Paul |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Washington County codes above are listed without a column we would have to invent.
Cities and towns in Washington County
A further 3 places in Washington 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 Washington County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Washington 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 Washington 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.