County Transportation Metrics is a project of the Washington State Association of Counties (WSAC) and will provide a roadmap for setting transportation priorities.

King County

King County is the most populous county in Washington State, and the 14th most populous county in the United States, with over 1.9 million residents. The county seat is Seattle, which is also the state's largest city.  King County is also listed as one of the top 100 highest income counties in the U.S.

In King County's early history, lumber, prospecting and mining were major industries.  In more recent years, aerospace, technology, health sciences and communications are among King County's largest industries.  Today, King County is the economic center of the Pacific Northwest and a major trade partner with Japan and China.  King County is also home to major public and private enterprises including Boeing, Microsoft, Amazon, Starbucks, Costco, PACCAR, Weyerhauser, Group Health, the University of Washington, and the Port of Seattle, which operates both the nation's eighth-largest port and Sea-Tac International Airport.

In addition to major urban population and employment centers, King County also includes a significant amount of rural land.  This area is characterized by small cities and towns, historic sites and buildings, farms, ranches and forests.  A large open space and park system also promotes a variety of recreational and tourism opportunities.  The combination of protected rural development and intensive urban development in close proximity to one another is one of the more unique characteristics of King County.

Population (OFM Databook, 2011) 

Population (2011) 1,942,600
Population Change (2000 to 2010)      2%
Land Area (Sq. Mi.) 2,115.57
Density (Population/Sq. Mi.) 918.24

Municipalities/Population 

Algona                                                         3,055
Beaux Arts
300
Bellevue
123,400
Black Diamond
4,160
Burien
47,660
Carnation
1,780
Clyde Hill
2,985
Covington
17,640
Des Moines
29,680
Duvall
6,715
Federal Way
89,370
Hunts Point
390
Maple Valley
22,930
Medina
2,970
Mercer Island
22,710
Newcastle
10,410
Normandy Park
6,345
North Bend
5,830
Redmond
55,150
Renton
92,590
Sammamish
46,940
SeaTac 27,110
Seattle 612,100
Shoreline 53,200
Skykomish 195

Major Highways

  • Interstate 5
  • Interstate 90
  • Interstate 405
  • US Route 2
  • State Route 18
  • State Route 99
  • State Route 520
  • State Route 16

County Roads (CRAB and OFM, 2011)

Total Center Lane Miles
1,632.25
Maintenance Expenditures
$ 37,325,715
Preservation Expenditures
$ 20,646,863
Improvement Expenditures
$ 32,053,333
 

County Revenues  & Expenditures (OFM Databook, 2011)

Total Revenues
$ 3,425,017,463
Total Expenditures
$ 3,405,690,818
Transportation Expenditures
$ 826,216,808



Performance Measures

Links & Sources


Washington State Association of Counties
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