South King County

Banner image for South King County 2019 regional report

Read the South King County 2019 Regional Report


Explore projects in your area

Link Light Rail

Federal Way Link Extension
Tacoma Dome Link Extension
South Boeing Access Road Infill Station

Sounder Commuter Rail

Kent Station Parking and Access Improvements
Auburn Station Parking and Access Improvements
Sounder South Capacity Expansion

Bus Rapid Transit

I-405 Bus Rapid Transit

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Key excerpts from the report

Transit helps keep the region moving as our population grows

By 2040, King County is projected to be home to almost 400,000 more people than in 2015. That’s like doubling the combined populations of Federal Way, Kent, Auburn, Burien and SeaTac. People are discovering the South King County quality of life at a record pace. But when all these people are on the roads at the same time, gridlock happens.

Light rail, Sounder trains and bus rapid transit (BRT) are the best options for moving thousands of people in South King County every hour without adding to freeway traffic.

Transit provides reliability

Traveling in their own rights of way, light rail trains deliver passengers to their destinations at the same time every day regardless of traffic.

Travel times from Federal Way to Seattle

South King County drive times chart

*Reliable travel time gets commuters to their destinations on time 19 out of 20 weekdays. Source: WSDOT 2017 Corridor Capacity report.


Transit construction and operation is paid for by a combination of local taxes, federal grants, borrowing through the issuance of bonds, fares and other sources. Sound Transit recently received its 24th annual Financial Statement and federal funding Single Audit conducted by the independent outside auditing firm KPMG. No material weaknesses have been found since these audits began in 1995. Sound Transit has one of the highest bond ratings of any transit agency in the country, allowing us to obtain loans at lower interest rates, which helps save taxpayer dollars. Sound Transit’s Board of Directors is made up of 17 local elected officials and the state Secretary of Transportation.

Image of sources and uses of Sound Transit revenue

Tax rollback

After voter-approved capital projects are completed, Sound Transit will reduce taxes to a level necessary to operate and maintain the system and pay associated debt service on outstanding bond.


More about Sound Transit: