Deadwood (Lakota: Owáyasuta; "To approve or confirm things") is a city in and county seat of Lawrence County, South Dakota, United States. It was named by early settlers after the dead trees found in its gulch. The city had its heyday from 1876 to 1879, after gold deposits had been discovered there, leading to the Black Hills Gold Rush. At its height, the city had a population of 25,000, attracting Old West figures such as Wyatt Earp, Calamity Jane, and Wild Bill Hickok (who was killed there).

According to the 2010 census, the population was 1,270. The entire town has been designated as a National Historic Landmark District, for its well-preserved Gold Rush-era architecture. Deadwood's proximity to Lead often prompts the two towns being collectively named "Lead-Deadwood".

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