Mattapoisett, Mattapoisett Free Public Library
Maynard, Maynard Public Library
Medford, Charlotte and William Bloomberg Medford Public Library
Merrimac, Merrimac Public Library
Millis, Millis Public Library
Milton, Milton Public Library
Monson, Monson Free Library and Reading Room Association
Montague, Carnegie Public Library
Monterey, Monterey Library
Natick, Morse Institute Library
