Washington State Route 525

State Route 525 (SR 525) is a state highway in Snohomish and Island counties in the U.S. state of Washington. The highway's south end is at Interstate 5 (I-5) and I-405 in Lynnwood. Its north end is at SR 20 near Coupeville. The highway uses the Whidbey Island Ferry to get to Whidbey Island.