Ocean City. 1 City (1990 pop. 5,146), Worcester co., SE Md., largest ocean resort in the state; inc. 1880. Ocean City is 28 mi (45 km) E of Salisbury and extends 10 mi (16 km) along a penisular barrier beach. Tourism is its economic mainstay, and the population greatly increases during the summer months. 2 City (1990 pop. 15,512), Cape May co., SE N.J., a resort on the Atlantic coast; inc. 1897. Ocean City is an 8-mi-long (13-km) island between the Atlantic Ocean and Great Egg Harbor Bay; it is linked to the mainland by a 2-mi (3.2-km) causeway. Its boardwalk, amusement rides, and proximity to other New Jersey beaches make it a popular summer vacation spot.