Mitchell Kingman (1744-1819) & Keturah Lattimer (1748-1835)were b & m in CN, travelled to VT, and ended up in Cincinnatus, Cortland Co NY. They had 4 sons: John, Mitchell Jr, George Washburn, & Justus/Justice. John (1770-1859) m Miriam Isbell and went to Cincinnatus - this is my line and I'm pretty sure your John is not in his family. Mitchell (1779 - aft 1830) m Sarah Crane, but I think they stayed in Addison Co VT. Justus (abt 1784 - ?) m Patty Lewis and remains elusive - there is a Justus in the 1820 Cortland census with 5 children, but he vanishes after that. George Washburn (1783 - 1867) m Samantha Isbell. He is in Cortland Co in 1810, 1820, and 1830. In 1850 he is in Erie Co NY & in 1860 he is in Cattaragaus Co NY where he died. I know he had at least 2 children: George Washburn Jr & Huldah. My guess is that your John is probably the son of George Washburn or possibley the son of Justus. There are several other Kingman men who appear in the 1850 Cortland census who are not in my line and may be other sons of George Washburn or even Justus. If you want to contact me privately at TMWJR13@yahoo.com, I can send you what I have in my database.