Mason County, Washington GenealogyEdit This Page
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Originally known as Sawamish County until January 3, 1864.
1854--Mason County was created 13 March 1854 from Thurston County. County seat: Shelton 
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- ↑ The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).