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.[3]

References

  1. ^ a b U.S. Geological Survey Geographic Names Information System: Plymouth, Washington
  2. ^ "Plymouth ZIP Code". zipdatamaps.com. 2022. Retrieved November 30, 2022.
  3. ^ Majors, Harry M. (1975). Exploring Washington. Van Winkle Publishing Co. p. 156. ISBN 978-0-918664-00-6.

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