MENTAL HEALTH ASSOCIATION of NASSAU COUNTY, INC. 186 Clinton Street, Hempstead, NY 11550 Tel: 516-489-2322 Fax: 516-489-2784 WHO WE ARE Our Mission The Mental Health Association of Nassau County is a not-for-profit organization dedicated to improving mental health through advocacy, education, program development and the delivery of direct services. WHAT WE DO Crisis & Referral Crisis & Suicide ...