ZIP Code 98040

98040 is one of Washington's ZIP codes, delivering to addresses in Mercer Island, King County.

City: Mercer Island
County: King County
State: Washington
Prefix: 980xx

Where this code sits

98040 is part of the 980xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Mercer Island.

Mercer Island Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 98040 delivers to without sharing its boundary.

ZIP codes nearest 98040

The ZIP codes whose reference points sit closest to 98040.
ZIP code	Distance	Delivers to
ZIP code 98118	2.6 mi	Seattle, WA
ZIP code 98006	3.4 mi	Bellevue, WA
ZIP code 98009	3.7 mi	Bellevue, WA
ZIP code 98015	3.7 mi	Bellevue, WA
ZIP code 98144	3.8 mi	Seattle, WA
ZIP code 98004	3.9 mi	Bellevue, WA
ZIP code 98108	4.2 mi	Seattle, WA
ZIP code 98056	4.2 mi	Renton, WA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 98040, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 98040. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.