With more than 3 million members and nearly $7.5 billion in annual revenue, Blue Shield of California is the states third largest health plan. Established in 1939 and headquartered in San Francisco, Blue Shield is a nonprofit corporation with approximately 4,500 employees and more than 20 offices throughout California. The company is a subsidiary of The Blue Cross and Blue Shield Association, a trade association for the independent, locally operated Blue Cross and Blue Shield plans. The nearly 40 local member companies of the BCBS Association have provided millions of families with quality, affordable health insurance for more than 70 years. One in three Americans carry Blue Cross and Blue Shield cards. The company is now one of the largest health benefits providers in America, serving more than 95 million people in all regions of the country. Blue Shield of California is located in Thousand Oaks, Calif.