School District (Middlesex County, 9–12, serving Lincoln and Sudbury) M Manchester-Essex Regional School District (Essex County, PK–12, serving Essex and Manchester) Martha's Vineyard Regional School District (Dukes County, 9–12, serving Aquinnah, Chilmark, Edgartown, Oak Bluffs, Tisbury and West Tisbury) Masconomet Regional School District (Essex County, 7–12, serving Boxford, Middleton and Topsfield) Mendon-Upton Regional School District (Worcester County, PK–12, serving Mendon and Upton) Mohawk Trail Regional School District (Franklin and Hampshire Counties, PK–12, serving Ashfield, Buckland, Charlemont (7–12), Colrain, Hawley (7–12), Heath, Plainfield, and Shelburne; also serving Rowe (7–12) through a grade tuition agreement) Monomoy Regional School District (Barnstable County, PK–12, serving Chatham and Harwich, Massachusetts) Mount Greylock Regional School District (Berkshire County, PK–12, serving Lanesborough and Williamstown; also serving Hancock (7–12) and New Ashford (PK–6 at Lanesborough Elementary School and 7–12 at Mount Greylock Regional High School) through grade tuition agreements) N Narragansett Regional School District (Worcester County, PK–12, serving Phillipston and Templeton) Nashoba Regional School District (Middlesex and Worcester Counties, PK–12, serving Bolton, Lancaster and Stow) Nauset Regional School District (Barnstable County, 6–12, serving Brewster, Eastham, Orleans and Wellfleet; also serving Provincetown (9–12) and Truro (7–12) through grade tuition agreements) New Salem-Wendell Regional School District (Franklin County, PK–6, serving New Salem and Wendell) North Middlesex Regional School District (Middlesex County, PK–12, serving Ashby, Pepperell and Townsend) Northborough-Southborough Regional School District (Worcester County, 9–12, serving Northborough and Southborough) O Old Rochester Regional School District (Plymouth County, 7–12, serving Marion, Mattapoisett and Rochester) P Pentucket Regional School District (Essex County, PK–12, serving Groveland, Merrimac and West Newbury) Pioneer Valley Regional School District (Franklin County, PK–12, serving Bernardston, Leyden, Northfield and Warwick) Q Quabbin Regional School District (Worcester County, PK–12, serving Barre, Hardwick, Hubbardston, New Braintree and Oakham) Quaboag Regional School District (Worcester County, PK–12, serving Warren and West Brookfield) R Ralph C. Mahar Regional School District (Franklin and Worcester Counties, 7–12, serving New Salem, Orange, Petersham and Wendell) S Silver Lake Regional School District (Plymouth County, PK and 7–12, serving Halifax, Kingston and Plympton) Somerset-Berkley Regional School District (Bristol County, 9–12, serving Berkley and Somerset) Southern Berkshire Regional School District (Berkshire County, PK–12, serving Alford, Egremont, Monterey, New Marlborough and Sheffield; also serving Mount Washington through a grade tuition agreement) Southwick-Tolland-Granville Regional School District (Hampden County, PK–12, serving Granville, Southwick and Tolland) Spencer-East Brookfield Regional School District (Worcester County, PK–12, serving East Brookfield and Spencer) T Tantasqua Regional School District (Hampden]