My parents grew up in Powhatan Point, and I concur:they usually just called it Powhatan.Originally one side of the town was called Industry and the other Powhatan Point, but both sides were eventually incorporated under the one name.
Emma Laughlin wrote a book about 1940, called *A Study of the Origin of Place Names of Belmont County, Ohio."In it she writes of the town Captina:"Captina is a small settlement on Captina creek, in the western part of the [York] township.The Captina post office was established September 18, 1832, with Isaiah Bryson as postmaster.It was discontinued July 15, 1907."It must have been privately published.The catalog info for it at the Ohio State Library was: R 977.11 B 2 c1
The description would put Captina on the border of York and Washington Townships in this map, while Powhatan is in the southeast corner of York Township: http://www.rootsweb.com/~ohbelmon/townships.htmlhttp://www.rootsweb.com/~ohbelmon/townships.html