ZIP Code 99346
About Plymouth
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.
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Area Profile
US Census (ACS 5-year · Gazetteer)
269
population
$50,588
median household income
2
people / sq mi
$214,700
median home value
41.0
median age
88
housing units
88
households
142.9
land area (sq mi)