ZIP Code 98850

98850 is one of Washington's ZIP codes, delivering to addresses in Rock Island, Douglas County.

City: Rock Island
County: Douglas County
State: Washington
Prefix: 988xx

Where this code sits

98850 is part of the 988xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Rock Island.

Rock Island Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 98850 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 98850

The ZIP codes whose reference points sit closest to 98850.
ZIP code	Distance	Delivers to
ZIP code 98828	3.5 mi	Malaga, WA
ZIP code 98802	7.1 mi	East Wenatchee, WA
ZIP code 98807	8.9 mi	Wenatchee, WA
ZIP code 98801	9.6 mi	Wenatchee, WA
ZIP code 98845	11 mi	Palisades, WA
ZIP code 98836	15 mi	Monitor, WA
ZIP code 98848	18 mi	Quincy, WA
ZIP code 98858	19 mi	Waterville, 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 98850, plotted from its record coordinates.

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

Scope ZIP code 98850. 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.