Custer is a city in Custer County, South Dakota, United States. The population was 1,919 at the 2020 census. It is the county seat of Cus…Custer is a city in Custer County, South Dakota, United States. The population was 1,919 at the 2020 census. It is the county seat of Custer County. Custer is the oldest town established by European Americans in the Black Hills. Gold was discovered east of Custer during the Black Hills Expedition, conducted by the 7th Cavalry led by Lt. Colonel George Armstrong Custer, a discovery which initiated the Black Hills Gold Rush.
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