With 2.1 million members, SEIU is the nation's largest and fastest-growing union, uniting workers in three sectors to improve their lives and the services they provide: health care, public services and property services. SEIU Virginia 512 isVirginia’s fastest-growing union, uniting home care providers across the Commonwealth and uniting county employees in both Fairfax and Loudoun. Our members organize to have a real voice in delivering quality public services to all Virginians.