Central Office: 500 Harrison Avenue, Boston, MA 02118
MA Toll Free: 1-866-Iamable (1-866-426-2253)
M.A.S.S. is a statewide self advocacy organization to ensure that people with disabilities are treated equally with other people. "We believe in empowering our members to speak out for ourselves and each other, and to stand by each other and make things better in our lives."