His visit comes ahead of the Democratic caucus on March 26. Despite a May primary for both parties, Democrats award their 118 delegates this month.
According to an analysis by the Seattle Times, Sanders has received more single donors in Washington than every other presidential candidate combined.
Sanders trails Hillary Clinton in delegates for the Democratic nomination, but is expected to do well in upcoming contests — including Washington.
Sanders’ Vancouver rally is scheduled to be held at Hudson’s Bay High School. Doors open at 11 Sunday morning.