Tillson is a hamlet in Ulster County, New York, United States. The population was 1,586 at the 2010 census.Tillson is in the Town of Rosendale, along routes 32 and 213.Tillson is located at 41°49′52″N 74°4′19″W / 41.83111°N 74.07194°W / 41.83111; -74.07194.According to the United States Census Bureau, the CDP has a total area of 2.3 square miles, of which, 2.3 square miles of it is land and 0.04 square miles of it is water.As of the census of 2000, there were 1,709 people, 629 households, and 452 families residing in the CDP. The population density was 738.4 per square mile. There were 676 housing units at an average density of 292.1/sq mi. The racial makeup of the CDP was 96.96% White, 1.05% African American, 0.29% Native American, 0.23% Asian, 0.06% from other races, and 1.40% from two or more races. Hispanic or Latino of any race were 1.93% of the population.There were 629 households out of which 37.4% had children under the age of 18 living with them, 58.