Riverside Washington ZIP Codes

Riverside holds a single ZIP code.

Every ZIP code in Riverside

The complete list of Riverside, Washington ZIP codes with the county each falls in.
ZIP code	County
98849	Okanogan 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Riverside codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Riverside. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Riverside 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 Riverside accounts for 2% of it.

Every Washington ZIP prefix and the region it covers →

Area codes covering Riverside

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 Riverside occupies.

509 Area code 509

Riverside Washington area codes in full →

Where Riverside's ZIP codes sit

Each point is one Riverside ZIP code, plotted from its record coordinates.

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

Cities near Riverside

The closest places to Riverside with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Omak Washington ZIP codes	6.3 mi	1 ZIP code
Okanogan Washington ZIP codes	11 mi	1 ZIP code
Conconully Washington ZIP codes	11 mi	1 ZIP code
Tonasket Washington ZIP codes	14 mi	1 ZIP code
Twisp Washington ZIP codes	30 mi	1 ZIP code
Oroville Washington ZIP codes	30 mi	1 ZIP code
Brewster Washington ZIP codes	30 mi	1 ZIP code
Winthrop Washington ZIP codes	31 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance.