SEIU Local 668 represents a variety of workers in various agencies providing quality services to the residents of Pennsylvania. Local 668 is a statewide union representing over 20,000 workers employed by state, county and municipal governments in the commonwealth, as well as in private social service agencies and mental health and developmentally disabled centers. Our parent union, the Service Employees International Union (SEIU), is a union with over 2 million members in the United States, Canada and Puerto Rico.