SEIU Local 509 - The Massachusetts Union for Human Service Workers & Educators
Non-profit OrganizationsMassachusetts, United States51-200 Employees
SEIU Local 509 is a mid-sized nonprofit organization based in Marlborough, Massachusetts, representing a broad workforce of human service workers and educators. It serves nearly 20,000 members and provides social services to elders, at-risk children, and people with mental illnesses or developmental disabilities, along with educational programs in public and private settings. Its members include mental health clinicians, social workers, early childhood educators, and university lecturers, spanning roles in social services and education. As part of the Service Employees International Union, SEIU Local 509 sits within a national federation known for its large membership and activity across health care, public services, and education. Operating within Massachusetts, the organization situates itself in the nonprofit sector and aligns with SEIU's broad sector focus, including four major areas: public services, long-term care, property services, and hospital systems.
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