Western Massachusetts

Western Massachusetts is a loosely defined geographical region of the U.S. state of Massachusetts which contains the Berkshires and the Pioneer Valley. Most commonly, the region is considered to include Berkshire, Franklin, Hampshire, and Hampden counties, though the eastern parts of the Quabbin Reservoir watershed are sometimes included.

In descending order of size, its largest communities are: Springfield, Chicopee, Pittsfield, Westfield, Holyoke, Northampton, Agawam, West Springfield (CDP), Amherst Center (CDP), Easthampton, Longmeadow (CDP), North Adams, and Greenfield (CDP).