Moosup is a village and census-designated place (CDP) in the town of Plainfield, Connecticut in the United States. The population was 3,231 at the 2010 census.
According to the United States Census Bureau, the CDP has a total area of 2.3 square miles (6.0 km2), of which, 2.2 square miles (5.7 km2) of it is land and 0.04 square miles (0.10 km2) of it (0.85%) is water.
As of the census of 2000, there were 3,237 people, 1,263 households, and 837 families residing in the CDP. The population density was 1,390.4 people per square mile (536.4/km2). There were 1,321 housing units at an average density of 567.4 per square mile (218.9/km2). The racial makeup of the CDP was 95.83% White, 0.59% African American, 0.68% Native American, 0.90% Asian, 0.96% from other races, and 1.05% from two or more races. Hispanic or Latino of any race were 3.12% of the population.
There were 1,263 households out of which 36.3% had children under the age of 18 living with them, 43.1% were married couples living together, 18.5% had a female householder with no husband present, and 33.7% were non-families. 26.0% of all households were made up of individuals and 9.8% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.06.