 In 1805 both Lewis and Jefferson counties were formed from Oneida County.In 1785, the township of Plattsburgh was formed in Washington County, and the next year all of Washington County was divided into townships, including the formation of Crown Point township which included all of future Essex County while Plattsburgh was expanded to include most of future Clinton County and Franklin counties.Towns in Franklin can all be traced back to Chateaugay, formed in 1799 a descendant of Plattsburgh.