Franklin County is a county located in the U.S. state of New York. As of the 2010 census, the population was 51,599. It is named in honor of American Founding Father Benjamin Franklin. Its county seat is Malone.
When counties were established in New York in 1683, the present Franklin County was part of Albany County. This was an enormous county, including the northern part of New York State as well as all of the present State of Vermont and, in theory, extending westward to the Pacific Ocean. This county was reduced in size on July 3, 1766 by the creation of Cumberland County, and further on March 16, 1770 by the creation of Gloucester County, both containing territory now in Vermont. On March 12, 1772, what was left of Albany County was split into three parts, one remaining under the name Albany County. One of the other pieces, Charlotte County, contained the eastern portion.
In 1788, Clinton County was split off from Washington County. This was a much larger area than the present Clinton County, including several other counties or county parts of the present New York State.
Franklin County is part of Macomb's Purchase of 1791.
In 1799, Clinton County was reduced in size by the splitting off of Essex County. In 1802, Clinton County was reduced in size by a part of Clinton and two other counties being taken to form the new St. Lawrence County.
In 1808, Franklin County was split off from Clinton County.