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

Mason County

Mason County encompasses the southern reach of Hood Canal and many bays and inlets of southern Puget Sound. The county seat is at Shelton, the county's only incorporated city. Formed out of King County in 1854, Mason County took is present name in 1864 in honor of Charles Mason, the first Secretary of Washington Territory.

After settlement, the mainstay of the economy was logging. Simpson Timber became not just the main employer, but the largest source of jobs in the state. As the importance of forest products declined, the county became an important recreation destination and bedroom community to Olympia and Tacoma. Oyster and seafood production and processing have also increased in economic importance.

Today Mason County's largest employer is the State of Washington, which operates a prison and the State Patrol Academy at Shelton.

Population (OFM Databook, 2011) 

Population (2011) 61,100
Population Change (2000 to 2010)      0.5%
Land Area (Sq. Mi.) 959.42
Density (Population/Sq. Mi.) 63.68


Shelton                                                      9,855

Major Highways

  • US Route 101
  • State Route 3
  • State Route 108
  • State Route 106

County Roads (CRAB and OFM, 2011)

Total Center Lane Miles
Maintenance Expenditures
$ 6,087,445
Preservation Expenditures
$ 4,710,030
Improvement Expenditures

County Revenues  & Expenditures (OFM Databook, 2011)

Total Revenues
$ 70,922,959
Total Expenditures
$ 70,931,017
Transportation Expenditures
$ 12,789,940


Performance Measures

Links & Sources

Washington State Association of Counties
206 Tenth Avenue SE | Olympia, WA 98501 | (360) 753-1886 | Fax (360) 753-2842
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