Amesbury, Andover, Ayer, Billerica, Bradford, Chelmsford, Dracut, Groton, Groveland, Harvard, Haverhill, Lawrence, Littleton, Lowell, Merrimac, Methuen, North Andover, North Chelmsford, Pepperell, Shirley, Tewksbury, Townsend, Tyngsboro, West Newbury, and Westford