I downloaded, free of charge, from the New York State Library the "New York State Gazetteer," New York State Department of Health, Albany; Barbara DeBuono, MD, MPH, Commissioner; 1995. The URL for this site is: http://www.nysl.nysed.gov/genealogy/findplace.htm, and if you scroll down, you will see "New York State Gazetteer (1995)" On page 42-- Code: 5556 Hamlet: Oakes Town: Lloyd County: Ulster According to this gazetteer, Oatka is in the town of Henrietia, county of Monroe. Hope this helps. Jeannette, Florida