McKean County Courthouse
P.O. Box 202
Smethport, Pa. 16749
Pennsylvania Department Of Health
City Clerk's Office
24 Kennedy St.
Bradford, PA 16701
There are no "State" Census in PA, only the Federal ones. The UPB Library has Pa. and NY Census index books 1800-1850, plus a few for other states in various years.
The aforementioned are "standard" histories of the area and copies for most of them are found in