Transportation & Logistics in Snohomish County

Land & Highway

Interstate and state highway access

Interstate 5, the primary north-south interstate linking Canada to California, runs directly through the county, carrying freight by truck to and from regional seaports and airports. US Route 2 extends east over Stevens Pass toward central and eastern Washington, and Interstate 405 branches south from Lynnwood to the Eastside employment centers. Together, these provide onward connection to the transcontinental Interstate 90 corridor via the regional interstate system.

State routes add dense local and freight connectivity throughout the county, including SR 9 (the main north-south arterial east of I-5), SR 99 (Evergreen Way, a major commercial corridor), SR 522 (southeast toward Monroe and Woodinville), SR 525/SR 20 (the Mukilteo ferry and Whidbey Island connection), SR 530 (the Arlington–Darrington corridor), and SR 526 (the "Boeing Freeway") which links I-5 directly to Paine Field and the aerospace manufacturing corridor.

Air

Local general aviation airports plus a global gateway

Snohomish County has air-service advantages found in few regions, anchored by a network of general aviation airports plus nearby international service.

Paine Field (PAE) is the county's premier aviation asset — home to Boeing's Everett widebody plant and a hub of the aerospace industry — offering a commercial passenger terminal with domestic airline service, extensive general aviation, and air-cargo capability. Arlington Municipal (AWO), owned by the City of Arlington, is a major general aviation facility with a 5,332-foot primary runway, roughly 580 based aircraft, and an adjacent 124-acre airport business park supporting offices, hangars, and light manufacturing. Harvey Field (S43) near downtown Snohomish is a privately owned, public-use field and one of the busiest in Puget Sound, with 200-plus based aircraft, flight training, and a range of aviation businesses. Additional public-use general aviation airports serve Darrington and Monroe (First Air Field).

For international passenger service and large-scale air cargo, Seattle-Tacoma International Airport (SEA) lies roughly 40 south, providing full global connectivity for high-value and time-sensitive freight.

Sea, Ports & Ferries

Two public port districts and Washington State Ferries

Snohomish County is home to two public port districts. The Port of Everett is a deep-draft public port on Puget Sound — one of the few in the Salish Sea capable of handling ocean-going vessels — with container, breakbulk, and barge facilities. It specializes in oversized aerospace components for Boeing programs alongside forest and bulk products, operates Foreign Trade Zone #85, and hosts the largest public recreational marina on the U.S. West Coast. The Port of Edmonds is an independently governed special-purpose district with a statutory economic-development mission; alongside one of the region's premier marinas and a boatyard, it manages commercial properties and waterfront redevelopment (including the Harbor Square business complex) and operates as a largely self-sustaining enterprise. Nearby, the Ports of Seattle and Tacoma (via the Northwest Seaport Alliance) add extensive containerized liner service.

Ferries

Washington State Ferries, operated as an extension of the state highway system and the largest ferry system in the United States, runs two routes with terminals in Snohomish County. The Mukilteo–Clinton route provides a roughly 20-minute crossing to Whidbey Island, and the Edmonds–Kingston route connects south county to the Kitsap Peninsula and the Olympic Peninsula beyond. Both carry vehicles, freight, and walk-on passengers, extend the county's commuter shed across Puget Sound, and connect to local transit at their terminals. The Mukilteo terminal is co-located with Sounder commuter rail and Community Transit service for multimodal connections.

Freight Rail

BNSF mainline with on-dock port connections

BNSF Railway, the largest rail operator in the state, owns the freight network in Snohomish County and connects the region via its mainline to the Midwest and national markets. The Port of Everett offers direct on-dock rail with roughly 12,500 lineal feet of terminal trackage and capacity for 106 railcars, providing seamless BNSF mainline-to-wharf transfer — and is the first port reached by westbound BNSF trains. Union Pacific reaches the region via its Seattle yard. Ongoing intermodal-yard and capacity improvements in north Everett are advancing to increase container throughput and reliability.

Transit: Light Rail & Bus

Regional connectivity, expanding north

Sound Transit's Link light rail reached Snohomish County with the opening of the Lynnwood Link Extension in August 2024, adding stations in Lynnwood and Mountlake Terrace with direct service toward downtown Seattle and Sea-Tac Airport. The Everett Link Extension will continue light rail north from Lynnwood to Everett Station — adding roughly 16 miles and six stations, including a planned station serving the Paine Field / Southwest Everett industrial corridor — with service currently projected in the 2037–2041 timeframe and design underway. Day-to-day transit is served by Community Transit (the county's primary bus agency, including Swift bus rapid transit), Everett Transit, and Sound Transit regional express service, plus Sounder commuter rail connecting Everett south through Seattle.