South Dakota became the 40th state to join the Union on November 2, 1889, with
Arthur C. Mellette elected as the new state's first governor.
Named for John L. Pennington, the Dakota Territory govenor, Pennington County was formed in 1875.
Pennington's first county seat was at a mining camp called Sheridan located at a spot which is
now Sheridan Lake.
This website is provided as an information service to Pennington County citizens.
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