The Atchison County Courthouse, located at the southwest corner of 5th and Parallel Streets in Atchison, is the seat of government of Atchison County, Kansas. The stone courthouse was built from 1896 to 1897 and replaced the county's first courthouse, which had been built in 1859. County officials wanted the courthouse to resemble the Franklin County Courthouse in Ottawa, so they hired that building's architect, George P. Washburn, to design the new courthouse.