OEHC patients have been members of these and other unions:

• Local 1199 SEIU
• American Federation of Labor
• American Federation of State, County and Municipal Employees
• American Federation of Teachers
• American Postal Workers Union
• Council of Iron Workers
• Civil Service Employees Association
• Communication Workers of America
• Council 82, Federation of Professional Athletes
• Federation of Professional Athletes
• Graphic Communications International Union
• International Association of Bridge, Structural and Ornamental Iron Workers
• International Association of Fire Fighters
• International Brotherhood of Painters and Allied Trades
• International Brotherhood of Teamsters, Chauffeurs and Warehousemen
• International Chemical Workers Union
• International Security Officers, Police and Guards Union
• International Union of Bricklayers and Allied Craftsmen
• International Union of Operating Engineers
• International Union of Police Association
• Laborers International Union of North America
• National Alliance of Postal and Federal Employees
• NYS Corrections Officers Patrolmen's Benevolent Association
• NYS Troopers PBA
• NYS United Teachers
• Office and Professional Employees International Union
• NYS Public Employee Federation
• Professional and Technical Engineers
• Service Employees International Union
• Sheet Metal Workers International Association
• Transport Workers Union of America
• United Brotherhood of Carpenters and Joiners of America
• United Association of Journeymen and Apprentices of the Plumbing and Pipefitters
• United University Professionals