Napanoch. Napanoch is a hamlet in Ulster County, New York, United States. It is at the junction of routes 209 and 55. The population was 1,131 at the 2020 census. Napanoch is on the Shawangunk Ridge National Scenic Byway, and is part of the Hudson River Valley National Heritage Area. Napanoch is from the Munsee dialect of the northern Lenape, and is thought to mean land overflowed by water. It is from the original deed to that area. Old Route 209 and Main Street follow the Minisink Trail, the Lenape path between the Hudson and Delaware Rivers. Louis Bevier, the New Paltz patentee, bought the area for two of his sons, Jean Bevier and Abram Bevier in 1705 or 1706. The Hoornbeek Store Complex and Ontario and Western Railroad Passenger Station are listed on the National Register of Historic Places. The imposing Eastern Correctional Facility was built by the state in 1900 as a reformatory. Since 1973 it has been a maximum security prison for men. Napanoch is in the Town of Wawarsing, in Ulster County. According to the United States Census Bureau, the census-designated place has a total area of 1.2 square miles, of which 1.2 square miles is land and 0.04 square miles is water.aywright.