Delta Dental of California and its affiliates, including Delta Dental Insurance Company, Delta Dental of Pennsylvania, Delta Dental of New York, and Delta Dental of West Virginia, together provide dental benefits to 36.5 million people in 15 states, the District of Columbia and Puerto Rico. All are members of the Delta Dental Plans Association, based in Oak Brook, Illinois, the not-for-profit national association of the 39 independent Delta Dental member companies that collectively cover more than 78 million people nationwide.