Northfield is a town located in Franklin County, Massachusetts. It was first settled in 1673 and was officially incorporated in 1723.
According to the United States Census Bureau, the town has a total area of 91.6 km² (35.4 mi²). 89.1 km² (34.4 mi²) of it is land and 2.5 km² (0.9 mi²) of it is water. The total area is 2.69% water.