Wellmark of South Dakota, which does business as Wellmark Blue Cross and Blue Shield of South Dakota, provides health care to residents of the Mount Rushmore State. The business provides health insurance products and related services to some 300,000 members in South Dakota. In true Blue Cross style, its members include employer groups, individuals, and seniors seeking Medicare supplement insurance. It also provides access to supplemental dental, vision, and disability coverage. Formed in 1948, the company is part of Wellmark, which serves more than 2 million people. Wellmark of South Dakota is also a licensee of the Blue Cross Blue Shield Association.