Grand Coulee Washington ZIP Codes
Grand Coulee holds a single ZIP code.
Every ZIP code in Grand Coulee
| ZIP code | County |
|---|---|
| 99133 | Grant 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Grand Coulee codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Grand Coulee. 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 Grand Coulee ZIP code begins 991. Those first three digits identify the sectional center facility that processes mail for this part of Washington. Statewide that range covers 67 ZIP codes, so Grand Coulee accounts for 1% of it.
Every Washington ZIP prefix and the region it covers →
Area codes covering Grand Coulee
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 Grand Coulee occupies.
Grand Coulee Washington area codes in full →
Where Grand Coulee's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Grand Coulee
| City | Distance | ZIP codes |
|---|---|---|
| Coulee Dam Washington ZIP codes | 2.4 mi | 1 ZIP code |
| Electric City Washington ZIP codes | 2.7 mi | 1 ZIP code |
| Elmer City Washington ZIP codes | 4.9 mi | 1 ZIP code |
| Nespelem Washington ZIP codes | 16 mi | 1 ZIP code |
| Almira Washington ZIP codes | 16 mi | 1 ZIP code |
| Hartline Washington ZIP codes | 18 mi | 1 ZIP code |
| Wilbur Washington ZIP codes | 18 mi | 1 ZIP code |
| Creston Washington ZIP codes | 26 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.