- Born: Abt 1810, Highgate, Franklin Co., Vermont
- Marriage (1): Mrs. 1 McCoy
- Marriage (2): Mary Lord
John, though being a step-son of Caleb Martin, was apparently accepted or adopted as a son, as he is listed as such in Caleb's Will, recorded on 16 Jan 1836.
John McCoy was town historian for Ellenburg Depot and Mooers, New York in 1840, and also in Clinton, New York. In 1860 many of his records burned. It has been written (but not verified) that John McCoy's family who were of Scottish descent came from Clarendon. It is unknown if that is Clarendon, Vermont or Clarendon, New York, or just Clarendon. The source was a history of Clinton done by a company planning to put modern windmills for energy in that area.
John was very active in the school system and donated the land for the first school in Clinton. The family was listed as members of the Baptist Church but any documentary was missing.
From the Chateaugay Record:
"John McCoy was one of the first settlers in the town (of Clinton, NY). He came from Grand Isle, Vermont in the year 1825, and located on Lot 88, in connection with Dorus Martin, his half-brother, and engaged in potash making. He built the first saw-mill in town on Lot 87, assisted by Allen Martin, which began running in 1850. He carried it on for seven or eight years."
John married Mrs. 1 McCoy. (Mrs. 1 McCoy was born about 1812.)
John next married Mary Lord. (Mary Lord was born about 1815.)