Place:Lyman, South Dakota, United States

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Lyman County is a county located in the U.S. state of South Dakota. As of the 2020 census, the population was 3,718. Its county seat is Kennebec.

Lyman County was created by the Dakota Territorial Legislature on January 8, 1873, but was not organized until May 21, 1893. Its boundaries were altered in 1891, 1897, 1898, and 1916. The county was named for W. P. Lyman, a politician.

Timeline

Date Event Source
1873 County formed Source:Red Book: American State, County, and Town Sources
1880 First census Source:Population of States and Counties of the United States: 1790-1990
1880 No significant boundary changes after this year Source:Population of States and Counties of the United States: 1790-1990

Population History

source: Source:Population of States and Counties of the United States: 1790-1990
Census Year Population
1880 124
1890 233
1900 2,632
1910 10,848
1920 6,591
1930 6,335
1940 5,045
1950 4,572
1960 4,428
1970 4,060
1980 3,864
1990 3,638

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