Geographic center of the United States is in South Dakota, about 17 miles (27 kilometers) west of Castle Rock in Butte County. Before Alaska became a state in 1959, the geographic center was in Smith County, Kansas. With the admission of Alaska, it moved to Butte County. When Hawaii became a state later in 1959, it shifted 6 miles (10 kilometers) west-southwest.
Geographic center of the United States
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