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 99341 Lind Adams County 509
WA 99343 Mesa Franklin County 509
WA 99344 Othello Adams County 509
WA 99345 Paterson Benton County 458, 509, 541
WA 99346 Plymouth Benton County 458, 509, 541
WA 99347 Pomeroy Garfield County 458, 509, 541
WA 99348 Prescott Walla Walla County 509
WA 99349 Mattawa Grant County 509
WA 99350 Prosser Benton County 458, 509, 541
WA 99352 Richland Benton County 509
Page 72 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.