Washington State Route 526

State Route 526 (SR 526), also known as the Boeing Freeway, is an east–west state highway in the U.S. state of Washington. The highway's west end is at SR 525 in Mukilteo. Its east end is at Interstate 5 (I-5), SR 99, and SR 527 in Everett. The highway connects to the Boeing Everett Factory. The highway is long.