Highmark Blue Cross Blue Shield serves the 29 counties of western Pennsylvania and 13 counties of northeastern Pennsylvania. Highmark Blue Shield serves the 21 counties of central Pennsylvania and also provides services in conjunction with a separate health plan in southeastern Pennsylvania. Highmark Blue Cross Blue Shield West Virginia serves the state of West Virginia plus Washington County. Highmark Blue Cross Blue Shield Delaware serves the state of Delaware. Highmark Blue Cross Blue Shield of Western New York serves eight counties in Western New York and Highmark Blue Shield of Northeastern New York serves 13 counties in Northeastern New York. Each of these companies is an independent licensee of the Blue Cross Blue Shield Association. Blue Cross, Blue Shield and the Blue Cross and Blue Shield symbols are registered marks of the Blue Cross Blue Shield Association, an association of independent Blue Cross and Blue Shield companies.