Los Altos (/lɔːs ˈæltoʊs/ (listen)) is a city in Santa Clara County, California, in northern Silicon Valley, in the San Francisco Bay Area. The population was 28,976 according to the 2010 census.
Most of the city's growth occurred between 1950 and 1980. Originally an agricultural town with many summer cottages and apricot orchards, Los Altos is now an affluent commuter town in Silicon Valley. Los Altos has commercial zones, strictly limited to the downtown area, as well as small shopping and office parks lining Foothill Expressway and El Camino Real.
Homes and other real estate are costly in Los Altos. The median household income of Los Altos for 2006–2010 was $149,964. The average home listing price in 2014 was $1.96 million. In 2017, Forbes put Los Altos (94022 and 94024) as the 3rd and 48th most expensive ZIP codes in the United States with median home prices of $7,755,000 and $3,431,615, respectively. In 2018, data from the American Community Survey revealed that Los Altos was the fifth wealthiest city in the United States.
Los Altos means "the heights" in Spanish.