Isla Vista is an unincorporated community in Santa Barbara County, California, in the United States. As of 2020 census, the community had a population of 15,500. For statistical purposes, the United States Census Bureau has defined the community as a census-designated place. The majority of residents are college students at the University of Californi…Isla Vista is an unincorporated community in Santa Barbara County, California, in the United States. As of 2020 census, the community had a population of 15,500. For statistical purposes, the United States Census Bureau has defined the community as a census-designated place. The majority of residents are college students at the University of California, Santa Barbara, or Santa Barbara City College. The beachside community of Isla Vista lies on a flat plateau about 30 feet in elevation, separated from the beach by a bluff.