|Mason County Washington Cities/Towns - Allyn, Belfair, Grapeview, Hoodsport, Kamilche, Lilliwaup, Matlock, Shelton (County Seat), Skokomish, Tahuya, Union
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Mason County is a county located in the U.S. state of Washington. As of 2000, the population was 49,405. The county seat is at Shelton.
It is named for the first Secretary of Washington Territory, C.H. Mason. Mason County was formed out of King County on March 13, 1854. Originally named Sahewamish County, it took its present name in 1864.