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Sumas is a small city in Whatcom County, Washington, United States. The population was 1069 in the 2005 census; an increase of 109 from the 2000 census. Sumas is located in Whatcom County; adjacent to the Canadian border and borders the city of Abbotsford, British Columbia. The Sumas-Huntingdon (Abbotsford) port of entry operates 24 hours per day.