Tryon County was a county in the colonial Province of New York in the British American colonies. It was created from Albany County on March 24, 1772, and was named for William Tryon, the last provincial governor of New York. The county's boundaries extended much further than any current county. Its eastern boundary with the also-new Charlotte County ran "from the Mohawk River to the Canada line, at a point near the old village of St. Regis and passing south to the Mohawk between Schenectady and Albany." It extended north to the St. Lawrence River; its western boundary was the Treaty of Fort Stanwix's Line of Property, following the Unadilla River, Oneida Lake, Onondaga River and Oswego River to Lake Ontario, as the Iroquois Confederacy still controlled locations further west in the Indian Reserve. Tryon County's seat was Johnstown, which is today the county seat of Fulton County. The Tryon County Courthouse, built in 1772–1773, was listed on the National Register of Historic Places in 1972. The Tryon County Jail, also built in 1772–1773, was listed on the National Register of Historic Places in 1981.