Plymouth, Washington

Plymouth, Washington
Plymouth, Washington with Columbia River in background.
Plymouth, Washington
Coordinates: 45°56′04″N 119°21′01″W / 45.93444°N 119.35028°W / 45.93444; -119.35028
CountryUnited States
StateWashington
CountyBenton
Elevation
292 ft (89 m)
Time zoneUTC-8 (Pacific (PST))
  Summer (DST)UTC-7 (PDT)
ZIP code
99346
Area code509
GNIS feature ID1507501

Plymouth is an unincorporated community in Benton County, Washington, United States. Plymouth is located on the Columbia River across from Umatilla, Oregon. It is south of the Tri-Cities and is served by Interstate 82. It was named by early settlers who felt a nearby rock promontory resembled Plymouth Rock.