Hamden is an unincorporated community in northern Choctaw County, Oklahoma. It is seven miles southeast of Antlers, Oklahoma.A United States Post Office was established at Hamden, Indian Territory on March 31, 1894 and operated until May 15, 1924. Hamden is on the boundary separating Choctaw County and Pushmataha County, and residents of the community live in both.During the 1880s the St.