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- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
- the text in this section is copied from an article in Wikipedia
Mason County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 65,726. The county seat and only incorporated city is Shelton. The county was formed out of Thurston County on March 13, 1854. Originally named Sawamish County, it took its present name in 1864 in honor of Charles H. Mason, the first Secretary of Washington Territory.[1]
Mason County comprises the Shelton, WA Micropolitan Statistical Area and is included in the Seattle-Tacoma, WA Combined Statistical Area.
Timeline
| Date | Event | Source
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| 1854 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1856 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1860 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1871 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1880 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1889 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1891 | Birth records recorded | Source:Red Book: American State, County, and Town Sources
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| 1892 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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Population History
- source: Source:Population of States and Counties of the United States: 1790-1990
| Census Year | Population
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| 1860 | 162
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| 1870 | 289
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| 1880 | 639
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| 1890 | 2,826
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| 1900 | 3,810
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| 1910 | 5,156
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| 1920 | 4,919
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| 1930 | 10,060
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| 1940 | 11,603
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| 1950 | 15,022
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| 1960 | 16,251
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| 1970 | 20,918
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| 1980 | 31,184
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| 1990 | 38,341
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