Grafton is a town in Worcester County, Massachusetts, United States. The population, indicated by the 2014 town records is 14,268, in nearly 5,700 households. Incorporated in 1735, Grafton is the home of a Nipmuc village known as Hassanamisco Reservation, the Willard House and Clock Museum, Community Harvest Project, and the Tufts University Cummings School of Veterinary Medicine. Grafton consists of the North Grafton, Grafton, and South Grafton geographic areas, each with a separate ZIP Code. Grafton also operates the state's largest On-Call Fire Department, with 74 members.