The Logan County Courthouse is a historic Second Empire building located on the southeastern corner of Main Street and Columbus Avenue in downtown Bellefontaine, Ohio, United States.[3] Built in 1870 at a cost of $105,398.08, the courthouse was constructed primarily of locally mined sandstone,[4] and it is covered with a mansard roof.[5] The courthouse is adjacent to Court Avenue, the first concrete street in the United States.[6]