Red Hook is a town in Dutchess County, New York, United States. The population was reported to be 10,408 during the 2000 census. The name is supposedly derived from the red foliage on trees on a small strip of land on the Hudson River. The town contains two villages; the village of Red Hook and the village of Tivoli. The town is in the northwest part of Dutchess County. US 9 and State Route 9G pass through the town. The town also contains two hamlets. Bard College is in the hamlet of Annandale-on-Hudson. The Unification Theological Seminary is in the hamlet of Barrytown. Both hamlets are located on the Hudson River and within the Hudson River Historic District.