The Sound Transit District Boundary
The Sound Transit District map, includes the most congested urban areas of King, Pierce, and Snohomish counties. The Sound Transit District boundary generally follows the urban growth boundaries created by each county in accordance with the state Growth Management Act.
Sound Transit District subareas
One of the unique features of the Sound Transit plan is that it delivers a fair share of investments to each of Sound Transit's five geographic areas:
- East King County
- Snohomish County
- South King County
- North King County
- Pierce County
The principle of subarea equity assures that Sound Transit taxes raised in each subarea are used for capital projects and operations that directly benefit that area. Priority projects for each subarea were identified through a public process involving established local elected official organizations.
Snohomish County Subarea: Includes the cities of Brier, Edmonds, Everett, Lynnwood, Mill Creek, Mountlake Terrace, Mukilteo and Woodway. The Snohomish County Subarea has an estimated population of 425,000.
North King County Subarea: Includes the cities of Seattle, Shoreline and Lake Forest Park. The North King subarea has an estimated population of 780,000.
South King County Subarea: Includes the cities of Algona, Auburn, Burien, Des Moines, Federal Way, Kent, Normandy Park, Pacific, SeaTac and Tukwila. Since 1990, this has been the fastest growing area of King County. The South King Subarea has an estimated population of 615,000.
East King County Subarea: Includes the cities of Beaux Arts, Bellevue, Bothell, Clyde Hill, Hunts Point, Issaquah, Kirkland, Medina, Mercer Island, Newcastle, Redmond, Renton, Woodinville, and Yarrow Point. The East King Subarea has an estimated population of 630,000.
Pierce County Subarea: Includes the cities of Bonney Lake, DuPont, Edgewood, Fife, Fircrest, Lakewood, Milton, Orting, Puyallup, Ruston, Steilacoom, Sumner, Tacoma and University Place. The Pierce County Subarea has an estimated population of 680,000.