
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 2025 population of 1,704. Sumas is currently growing at a rate of 1.19% annually and its population has increased by 6.1% since the most recent census, which recorded a population of 1,606 in 2020.
The average household income in Sumas is $94,831 with a poverty rate of 11.33%. The median age in Sumas is 32.1 years: 30 years for males, and 35.7 years for females.