List of state highways in Snohomish County, Washington

The list of highways in Snohomish County, Washington is a list of all county and state highways located in Snohomish County, Washington. These roads account for of the highway system in Washington. Most roads within the county are short connectors, while others are sections of long highways. There are two interstate highway in Snohomish County, Interstate 5, and Interstate 405. There is one U.S. Highway, U.S. Route 2 and 16 state-numbered signed routes in the county, the longest being SR 9.

The longest state route is the span of SR 9, spaning in the county alone. The shortest state route is SR 528, which is only long. These roads supply some of the major cities in Snohomish County, including Everett, Edmonds, Marysville, Lynnwood, Bothell, Arlington, and Monroe.

Highways

Interstate highways

There are two Interstates that make up about of all highways in the Snohomish County. Interstate 5 is one of two interstate highways to enter Snohomish County, traveling for within the county, with 28 interchanges along the way, excluding 3 which are for HOV users only and 1 for buses only. Exits off the highway serve Mountlake Terrace, Lynnwood, Mill Creek, Everett, Marysville, Arlington, and Stanwood. The highway replaced U.S. Route 99, an old U.S. highway that connected Canada to Mexico, which Interstate 5 currently does.

Interstate 405 is the other interstate highway to enter Snohomish County, traveling for within the county, with 2 interchanges along the way. Exits off the highway serve Lynnwood, Mill Creek, and Bothell. The highway terminates at an interchange with Interstate 5/SR 525 in Lynnwood.

U.S. highways

There have been three U.S. highways in Snohomish County. The longest—and the only current one—is U.S. Route 2, which spans for over within the couty. Since its designation in 1926, US 2 services the cities of Everett, Snohomish, Monroe, Sultan, Gold Bar, and Index before leaving for Chelan County.

U.S. Route 99 and U.S. Route 10 Alternate once traversed Snohomish County. U.S. Route 99 roughly used the route of present-day Interstate 5. U.S. Route 10 Alternate followed U.S. Route 99 from King County to Everett and turns east on current U.S. Route 2 to Chelan County. Both highways were either decomissioned or decertified.

State routes

There are 16 state routes and 4 bannered state routes that make up about of all highways in Snohomish County. The longest route in the county is SR 9, which spans from Woodinville in the south to Skagit County in the north. Most highways have the first digit as 5, which means they connect or are related to I-5. Only 6 highways in the county do not have 5 as their first digit like SR 9, SR 92, SR 96, SR 104, and SR 203.

Statistics

The chart below shows current interstate, U.S., and state highways by year of commissioning, length, and cities crossed.

Bannered routes

The chart below shows current state bannered routes by year of commissioning, length, and city. For a list of bannered U.S. Routes, see List of bannered U.S. Routes and for Interstates, see List of Business Routes of the Interstate Highway System.