Bellingham (/ˈbɛlɪŋhæm/ BEL-ing-ham) is a city in and the county seat of Whatcom County in the U.S. state of Washington. It lies 21 miles (34 km) south of the Canada–United States border, between Vancouver, British Columbia, 52 miles (84 km) to the northwest and Seattle 90 miles (140 km) to the south.
The population was 91,482 at the 2020 census, and estimated to be 94,720 in 2023. It is the site of Western Washington University, Bellingham International Airport, and the southern terminus of the Alaska Marine Highway. Bellingham is the northernmost city with a population of more than 90,000 people in the contiguous United States.