Carolina (kärōlēˈnä) [key], city (1990 pop. 177,806), Puerto Rico. Located 7 mi (11 km) SE of San Juan, it is a residential suburb of the capital, as well as a commercial and industrial center. Pharmaceuticals and chemical and electronic products are manufactured. Many banking institutions are there, as are the Univ. of Puerto Rico–Carolina, the Universidad del Caribe, and the Colegio Universitario del Este. Louis Muñoz Marín international airport is located in Carolina.