Chimacum is an unincorporated community on the Olympic Peninsula in the American state of Washington at coordinates 48°0′42″N, 122°46′10″W. It was named after the Chemakum (or Chimacum) group of Native Americans that lived there until the late 19th century. The Olympic Peninsula is the large arm of land in western Washington state that lies across Puget Sound from Seattle. ... Official language(s) None Capital Olympia Largest city Seattle Area  Ranked 18th  - Total 71,342 sq. ... Chemakum (English pronunciation: [ˈʧɛməkəm]) (also written as Chimakum or Chimacum) were a Native American group that once lived on western Washington states Olympic Peninsula. ... Chimacum, or Chemakum, were a Native American group that once lived on western Washington states Olympic Peninsula. ... This article is the current U.S. Collaboration of the Week. ...