Ellenville is a village in Ulster County, New York, United States. The telephone exchange is predominantly 647 and an overlaid 210 in the 845 area code. According to the United States Census Bureau, the village has a total area of 8.8 square miles (22.7 square kilometer). 8.7 square miles (22.6 Square kilometer) of it is land and 0.1 square miles (0.2 Square kilometer) of it is water. The total area is 0.68% water.