Oceanside is a city located in San Diego County, California, with a population of around 175, 000 people. Coronado is a resort city located on an island connected to the mainland by a bridge, just across the bay from San Diego. Lamesa is a small city located in the East County region of San Diego County. La Jolla is a coastal community located within the city of San Diego. Chula Vista is the second largest city in San Diego County, with a population of over 270, 000 people.