U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records

All states and U.S. territories

Maps and coordinates

State directory

Washington ZIP Codes

Complete postal directory, details, and geographic map for the State of Washington.

State	ZIP Code	City	County	Area Codes
WA	98840	Okanogan	Okanogan County	`509`
WA	98841	Omak	Okanogan County	`509`
WA	98843	Orondo	Douglas County	`509`
WA	98844	Oroville	Okanogan County	`509`
WA	98845	Palisades	Douglas County	`509`
WA	98846	Pateros	Okanogan County	`509`
WA	98847	Peshastin	Chelan County	`509`
WA	98848	Quincy	Grant County	`509`
WA	98849	Riverside	Okanogan County	`509`
WA	98850	Rock Island	Douglas County	`509`

Page 52 of 74

Geographic Map of Washington

Postal context

About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.