Washington Missouri ZIP Codes
Washington holds a single ZIP code.
Every ZIP code in Washington
| ZIP code | County |
|---|---|
| 63090 | Franklin County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Washington. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Washington ZIP code begins 630. Those first three digits identify the sectional center facility that processes mail for this part of Missouri. Statewide that range covers 65 ZIP codes, so Washington accounts for 2% of it.
Every Missouri ZIP prefix and the region it covers →
Area codes covering Washington
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Washington occupies.
Washington Missouri area codes in full →
Where Washington's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Washington
| City | Distance | ZIP codes |
|---|---|---|
| Marthasville Missouri ZIP codes | 5.9 mi | 1 ZIP code |
| Augusta Missouri ZIP codes | 7.4 mi | 1 ZIP code |
| Union Missouri ZIP codes | 8.0 mi | 1 ZIP code |
| New Haven Missouri ZIP codes | 12 mi | 1 ZIP code |
| New Melle Missouri ZIP codes | 14 mi | 1 ZIP code |
| Leslie Missouri ZIP codes | 15 mi | 1 ZIP code |
| Pacific Missouri ZIP codes | 15 mi | 1 ZIP code |
| Foristell Missouri ZIP codes | 18 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.