Sound Transit

Who is Sound Transit?

Sound Transit is a public transit agency that plans, builds and operates express bus, light rail and commuter train services in the urban areas of King, Pierce and Snohomish counties.

Sound Transit Express bus icon

ST Express bus

ST Express bus routes serve urban centers in Pierce, King and Snohomish Counties. Twenty-eight routes provide fast service between major cities and job centers and allow for easy transfers to train service and local buses. ST Express service is offered seven days a week for many routes.

Sound Transit bus rapid transit bus icon

Bus Rapid Transit (coming soon!)

The bus rapid transit (BRT) system will be designed for fast arrivals and departures, with features such as off-board fare payment and multiple-door entry and exit. Transit improvements such as new business access and transit lanes and bus queue jumps will help riders avoid traffic congestion and enjoy more frequent and reliable service.

Sounder commuter rail icon

Sounder commuter rail

Our Sounder trains travel between Lakewood and Seattle (making stops in South Tacoma, Tacoma, Puyallup, Sumner, Auburn, Kent and Tukwila) and between Everett and Seattle (making stops in Mukilteo and Edmonds). Sounder regularly runs weekday mornings and afternoons with weekend service for major events.

Sound Transit Link light rail icon

Currently, Link light rail runs from Angle Lake and Sea-Tac Airport through downtown Seattle and to the University of Washington. Construction is underway to extend service to Northgate in 2021 and to Bellevue and East King County by 2023. By 2024, service will further extend to Federal Way, Lynnwood and downtown Redmond. Link light rail runs seven days a week with trains running every 6, 10 or 15 minutes depending on the time of day.

Our Board

Sound Transit is governed by an 18-member Board made up of local elected officials and the Secretary of the Washington State Department of Transportation. The board establishes policies and gives direction and oversight.


The system plan is paid for with a combination of voter-approved local taxes, federal grants, farebox revenues, borrowed funds and interest revenues.