Mercer Island Washington ZIP Codes
Mercer Island holds a single ZIP code.
Every ZIP code in Mercer Island
| ZIP code | County |
|---|---|
| 98040 | King 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Mercer Island codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Mercer Island. 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 Mercer Island ZIP code begins 980. Those first three digits identify the sectional center facility that processes mail for this part of Washington. Statewide that range covers 71 ZIP codes, so Mercer Island accounts for 1% of it.
Every Washington ZIP prefix and the region it covers →
Area codes covering Mercer Island
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Mercer Island occupies.
Mercer Island Washington area codes in full →
Where Mercer Island's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Mercer Island
| City | Distance | ZIP codes |
|---|---|---|
| Bellevue Washington ZIP codes | 4.2 mi | 7 ZIP codes |
| Medina Washington ZIP codes | 4.4 mi | 1 ZIP code |
| Renton Washington ZIP codes | 6.1 mi | 5 ZIP codes |
| Seattle Washington ZIP codes | 6.8 mi | 59 ZIP codes |
| Issaquah Washington ZIP codes | 8.6 mi | 2 ZIP codes |
| Sammamish Washington ZIP codes | 9.2 mi | 2 ZIP codes |
| Kirkland Washington ZIP codes | 9.3 mi | 3 ZIP codes |
| Redmond Washington ZIP codes | 9.5 mi | 3 ZIP codes |
Straight-line distance between place reference points, not driving distance.