The City of Blaine sits on the international border to British Columbia, Canada. Blaine has two border crossings. The Douglas crossing also know as the Peace Arch crossing is the busiest crossing between Washington state and British Columbia, Canada. The Pacific Highway crossing also known as the Truck Crossing (SR-543), sits just east of the Peace Arch crossing. There is also a border crossing from British Columbia in to Point Roberts known as the Boundary Bay Crossing.

Covid-19 border measures ended on October 1, 2022.