CVS or CVS Caremark is the biggest pharmacy health care company in the US. It aims to provide patients and customers the best health care service at a reasonable price. They have businesses in different facets of the industry like retail clinics, mail order pharmacy, store-type pharmacy and Medicare Part D Plans. Headquartered in Woonsocket, Rhode Island, there are thousands of branch of CVS all over the US. In fact, almost all the states have CVS in them.