Washington State Route 527

State Route 527
Bothell–Everett Highway
A map of southwest Snohomish County with SR 527 highlighted in red
Route information
Auxiliary route of I-5
Maintained by WSDOT
Length	9.29 mi[1] (14.95 km)
Existed	1964–present
Major junctions
South end	I-405 in Bothell
Major intersections	SR 524 in Bothell SR 96 in Everett
North end	I-5 / SR 99 / SR 526 in Everett
Location
Country	United States
State	Washington
County	Snohomish
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 526 → SR 528

State Route 527 (SR 527, also known as the Bothell–Everett Highway) is a state highway in Snohomish County, Washington. It travels 9 miles (14 km) from north to south, connecting the northern Seattle suburbs of Bothell, Mill Creek, and Everett. The highway intersects Interstate 405 (I-405) at its southern terminus, SR 96 in northern Mill Creek, and I-5 at an interchange with SR 99 and SR 526 in Everett.

The Bothell–Everett Highway was built in the 1910s as part of the intercity Pacific Highway and briefly formed part of U.S. Route 99 (US 99) in 1926. The following year, US 99 was moved west to a new highway that would later become modern-day SR 99. The old route to the east was signed by the state as Secondary State Highway 2A (SSH 2A) from 1937 to 1943 and SSH 2J from 1957 to 1964, when it was renumbered as SR 527.

Since its opening, suburban development in Mill Creek and northern Bothell has contributed to traffic congestion on stretches of SR 527. During the 1990s and early 2000s, the state government funded several projects that widened the highway to its present four-lane configuration with sidewalks, bus pullouts, and bicycle lanes. The southernmost 2.5 miles (4.0 km) of the highway, from SR 522 to I-405, was transferred to the Bothell city government in 2011 and decommissioned from the state highway system.