Vista is a city in San Diego County, California. Vista is a medium-sized city within the San Diego-Carlsbad, CA Metropolitan Area. As of the 2020 Census, Vista had a population of 98,381. Current data estimates a 2023 population of 99,835. Vista's sphere of influence also includes portions of unincorporated San Diego County to the north and east, with a county island in the central west. Located just 7 mi inland from the Pacific Ocean, it has a Mediterranean climate.