City · Washington · United States
Mercer Island, WA — ZIP codes
1 ZIP code · King County
- City
- Mercer Island
- County
- King
- State
- Washington
- Country
- United States
- Postal code
- 98040Single source
- Coordinates
- 47.5603, -122.2281 View on OpenStreetMap
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 98040 | Mercer Island | Single source |
Sources and verification
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. Last generated : 2026-08-21. Report an error.