High Quality Content by WIKIPEDIA articles! Ocean City, sometimes known as OC, or OCMD, is an Atlantic Ocean resort town in Worcester County, Maryland, United States. Ocean City is widely known in the Mid-Atlantic region of the United States and is a frequent destination for vacationers in that area. The population was 7,173 at the 2000 census, although during summer weekends the city hosts between 320,000 and 345,000 vacationers.