Lyman County, South Dakota

Lyman County
Lower Brule Indian Reservation
Map of South Dakota highlighting Lyman County
Location within the U.S. state of South Dakota
Map of the United States highlighting South Dakota
South Dakota's location within the U.S.
Coordinates: 43°54′N 99°51′W / 43.9°N 99.85°W / 43.9; -99.85
Country United States
State South Dakota
Founded1893
Named forW. P. Lyman
SeatKennebec
Largest communityLower Brule
Area
 • Total1,707 sq mi (4,420 km2)
 • Land1,642 sq mi (4,250 km2)
 • Water65 sq mi (170 km2)  3.8%
Population
 (2020)
 • Total3,718
 • Estimate 
(2023)
3,705 Decrease
 • Density2.2/sq mi (0.84/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional districtAt-large
Websitewww.lymancounty.org

Lyman County is a county located in the U.S. state of South Dakota. As of the 2020 census, the population was 3,718.[1] Its county seat is Kennebec.[2]

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.[3] The county was named for W. P. Lyman, a politician.[4]

  1. ^ "State & County QuickFacts". United States Census Bureau. Retrieved March 21, 2024.
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  3. ^ Individual County Chronologies/Lyman County (accessed February 5, 2019)
  4. ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. US Government Printing Office. p. 192.

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