ZIP code · Grand Coulee · Washington · United States
ZIP code 99133 — Grand Coulee
ZIP code 99133 serves Grand Coulee, Washington.
- Postal code
- 99133Single source Value from one source, not cross-checked.
- City
- Grand Coulee
- County
- Grant
- State
- Washington
- Country
- United States
- Coordinates
- 47.9385, -118.9978 — precision precise (locality)
View on OpenStreetMap - Population
- 1,341 (ZCTA, ACS 5-year)
- Median household income
- $49,625
- Median age
- 50.2
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
- Area code
- 509 (from the nearest rate centre)Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS). Data generated on 2026-08-21. Methodology · Report an error on this page