Coulee City Washington ZIP Codes
Coulee City holds a single ZIP code.
Every ZIP code in Coulee City
| ZIP code | County |
|---|---|
| 99115 | 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Coulee City codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Coulee City. 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 Coulee City 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 Coulee City accounts for 1% of it.
Every Washington ZIP prefix and the region it covers →
Area codes covering Coulee City
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 Coulee City occupies.
Coulee City Washington area codes in full →
Where Coulee City's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Coulee City
| City | Distance | ZIP codes |
|---|---|---|
| Hartline Washington ZIP codes | 10 mi | 1 ZIP code |
| Wilson Creek Washington ZIP codes | 15 mi | 1 ZIP code |
| Soap Lake Washington ZIP codes | 18 mi | 1 ZIP code |
| Almira Washington ZIP codes | 18 mi | 1 ZIP code |
| Mansfield Washington ZIP codes | 21 mi | 1 ZIP code |
| Ephrata Washington ZIP codes | 24 mi | 1 ZIP code |
| Electric City Washington ZIP codes | 24 mi | 1 ZIP code |
| Grand Coulee Washington ZIP codes | 26 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.