San Carlos is a city in San Mateo County, California on the San Francisco Peninsula, about halfway between San Francisco and San Jose. It is a small affluent residential suburb located between Belmont to the north and Redwood City to the south. The population was 28,406 at the 2010 census.

San Carlos, "The City of Good Living", aims for a "small town" feel. Its main downtown area is composed mostly of small shops and restaurants. San Carlos was the first city in California to open a charter school (San Carlos Charter Learning Center), and its schools rank consistently well in statewide lists.

San Carlos is home to San Carlos Airport and two museums. Located downtown, the San Carlos History Museum is dedicated to the display of the history of the town from early Native American history to the space age. This museum is open every Saturday from 1:00 PM to 4:00 PM. The Hiller Aviation Museum, a museum specializing in helicopter and aviation history, offers interactive exhibits and more than forty aircraft including a replica of the first aircraft to fly, a spy drone with a 200-foot wingspan, and the nose section of a Boeing 747.

Transportation options include membership in the SamTrans (San Mateo County Transit) bus system and a Caltrain station. The administrative headquarters of both agencies are located at 1250 San Carlos Avenue. As of 2003^[update], the city began experimenting with a free shuttle bus service named S.C.O.O.T to help with transportation difficulties for those living in the hills of the town, and especially to make up for a lack of school buses. However, voters rejected a parcel tax which placed 100% of the financial burden on property owners and the S.C.O.O.T program was dismantled on June 17, 2005.

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