Langley is a town in Mayes County, Oklahoma, United States. The population was 819 at the 2010 census. Langley, still located at its original site, is on State Highway 82 at the west end of the Pensacola Dam, which is on the National Register of Historic Places listings in Mayes County, Oklahoma. The dam holds back the Grand Lake o' the Cherokees. D…Langley is a town in Mayes County, Oklahoma, United States. The population was 819 at the 2010 census. Langley, still located at its original site, is on State Highway 82 at the west end of the Pensacola Dam, which is on the National Register of Historic Places listings in Mayes County, Oklahoma. The dam holds back the Grand Lake o' the Cherokees. Dam construction started in 1935. Cliff Bogle, the original owner in the area, divided his land into lots, and in 1937 the Town was established with a public dedication and drawing for free lots. The Town was named for Oklahoma State Senator J. Howard Langley. Langley incorporated on November 20, 1939, and a post office was established on January 20, 1939. The Dam was completed in 1941, and the town began to promote itself to the recreation industry. The Dam itself is on the National Register of Historic Places listings in Mayes County, Oklahoma.