I have information regarding the Josiah Hinckley listed as living in Watervliet in 1790.Here's what I have on him:
Josiah Hinckley b. June 29, 1760 in Dutchess County, NY(not 100% convinced this is his true bday). Probably the son of Thomas Hinckley and Elizabeth DeCosta from Barnstable Co, MA.
Josiah m. 1st Alice Kelley b. Dutchess Co, NY. Had children: Josiah b. December 03, 1789 Alice b. May 03, 1793 (1790 census suggests there may be two other daughters born before 1790)
Josiah m. 2nd Elizabeth Ellis Had children: Elizabeth b. April 21, 1803 Dorcas b. September 21, 1806
Josiah and family seemed to migrate originally from Dutchess Co (living there in 1776), to Watervliet(c1790), Coeymans (c1800-1810), and then finally settled in Westerlo (1810 on), Albany Co.I have seen reference to a Josiah living in Middletown, Delaware Co. but don't know much about if he was one of the Josiah's listed above.