There are 16 zip codes in Grant County, Washington. The most populated is 98837, located in Moses Lake. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
9883746,959Moses Lake
9884812,959Quincy
9882312,638Ephrata
993497,531Mattawa
988515,196Soap Lake
993573,973Royal City
988573,545Warden
991331,377Grand Coulee
991151,224Coulee City
99123852Electric City
99321851Beverly
99135452Hartline
98824231George
98860229Wilson Creek
98832153Marlin
98853Stratford
showing: 16 rows

Zip Codes in Grant County, Washington by Population (2024)