Rock Island Washington ZIP Codes
Rock Island holds a single ZIP code.
Every ZIP code in Rock Island
| ZIP code | County |
|---|---|
| 98850 | Douglas 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Rock Island codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Rock 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 Rock Island ZIP code begins 988. Those first three digits identify the sectional center facility that processes mail for this part of Washington. Statewide that range covers 46 ZIP codes, so Rock Island accounts for 2% of it.
Every Washington ZIP prefix and the region it covers →
Area codes covering Rock Island
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Rock Island occupies.
Rock Island Washington area codes in full →
Where Rock Island's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Rock Island
| City | Distance | ZIP codes |
|---|---|---|
| East Wenatchee Washington ZIP codes | 7.3 mi | 1 ZIP code |
| Wenatchee Washington ZIP codes | 9.8 mi | 2 ZIP codes |
| Quincy Washington ZIP codes | 17 mi | 1 ZIP code |
| Cashmere Washington ZIP codes | 18 mi | 1 ZIP code |
| Waterville Washington ZIP codes | 19 mi | 1 ZIP code |
| Entiat Washington ZIP codes | 21 mi | 1 ZIP code |
| George Washington ZIP codes | 24 mi | 1 ZIP code |
| Ephrata Washington ZIP codes | 29 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.