Sumas
- County:
- Whatcom County
- County Seat:
- No
- Area (mi²):
- 1.467
- State:
- Washington
Sumas is a city located in Whatcom County, Washington. Sumas has a 2026 population of 1,683. Sumas is currently growing at a rate of 1.08% annually and its population has increased by 4.73% since the most recent census, which recorded a population of 1,607 in 2020.