NAMI of Westchester Return to Directory Description NAMI, the National Alliance on Mental Illness, is the nation’s largest grassroots mental health organization dedicated to building better lives for the millions of Americans affected by mental illness.Website http://www.namiwestchester.orgPhone 914 592-5458Address 100 Clearbrook Rd # 181City ElmsfordNY10523Categories All, Civic Organizations, Health & Well-Being November 6, 2017 5:18 pm | by TanyaDirectory Categories: All, Civic Organizations, and Health & Well-Being.