ZIP Code 98040 – Mercer Island, WA
Mercer Island, Washington · King County · Pacific time
| ZIP code | 98040 |
|---|---|
| City | Mercer Island |
| State | Washington |
| County | King County |
| Population | 25,307 |
| Time zone | Pacific · local time |
| ZIP type | Standard (has a Census ZCTA area) |
| Land area | 6.38 sq mi |
| Center (lat, long) | 47.5640, -122.2312 |
Area codes in this area
These are the area codes that most often serve ZIP 98040 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Map
Nearby ZIP codes
About ZIP 98040
ZIP code 98040 is assigned to Mercer Island, Washington. It lies in King County. Its Census area covers about 6.38 square miles of land. The closest neighboring ZIP is 98118 (Seattle), about 2.3 miles away.
Every address in 98040 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.
Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources