South Mound, Kansas
South Mound is an unincorporated community in Neosho County, Kansas, United States. History. South Mound was located on the Missouri–Kansas–Texas Railroad. The railroad tracks were removed in 1989 following the M-K-T's merger with Missouri Pacific. A post office was opened in South Mound in 1872, and remained in operation until it was discontinued in 1971. Demographics. For statistical purposes, the United States Census Bureau has defined this community as a census-designated place (CDP).