South San Francisco is a city in San Mateo County, California, United States, located on the San Francisco Peninsula in the San Francisco Bay Area. The population was 60,552 at the 2000 census. South San Francisco lies north of San Bruno and San Francisco International Airport in a small valley south of Daly City, Colma, Brisbane, and San Bruno Mountain, east of Pacifica and the hills of the Coast Range, and west of the waters of San Francisco Bay. Most of the valley faces San Francisco Bay, affording bay views from higher levels. South San Francisco has mild winters and dry cool summers. The hills to the west shield the city from much of the fog that prevails in neighboring areas. Population has tripled since World War II with the opening of such subdivisions as Buri Buri, Winston Manor and Westborough on the slopes west of El Camino. It has grown from 4,411 in 1920 to 61,824 in 2006. Sign Hill proclaims the moniker "The Industrial City", which applies mainly to the flat land east of the Bayshore Freeway (US 101). Locals prefer to refer to the town as "South City," in much the same way that San Francisco is called "The City. " People unfamiliar with the area often mistake "South San Francisco" as the southern part of the city of San Francisco. In fact, the city of South San Francisco is not even contiguous with the city of San Francisco.