Alderson is a town in Pittsburg County, Oklahoma, United States. The population was 304 at the 2010 census. A post office was established at Alderson, Indian Territory on March 5, 1890. It was named for William Charles Alderson, treasure of the Choctaw, Oklahoma and Gulf Railroad. W.C. Alderson, under the name "Willy," was one of the children writte…Alderson is a town in Pittsburg County, Oklahoma, United States. The population was 304 at the 2010 census. A post office was established at Alderson, Indian Territory on March 5, 1890. It was named for William Charles Alderson, treasure of the Choctaw, Oklahoma and Gulf Railroad. W.C. Alderson, under the name "Willy," was one of the children written about and the source of much of the material in Mary Howitt's Our Cousins in Ohio.