Sumas is a small town in Whatcom County, Washington, United States. The population was 1,407 at the most recent census. Sumas is located adjacent to the Canadian border and borders the city of Abbotsford, British Columbia. The Sumas-Huntingdon port of entry at the north end of State Route 9 operates 24 hours a day. Sumas shares Nooksack Valley School District with the towns of Nooksack and Everson.