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) is a city in Alameda County, California, United States. The population was 73,345 at the 2000 census, but estimated by city officials to be presently in 100,000 + . Livermore is located in the Bay Area. Livermore is a "middle-size city" in the Bay Area.
Traditionally, Livermore is considered the easternmost city in the Bay Area before entrance to the Central Valley.
It was founded by William Mendenhall and named after Robert Livermore, his friend and a local rancher who settled in the area in the 1830s.
Livermore's south side, home to local vineyards, has developed several executive subdivisions near Ruby Hill. The city has also redeveloped its downtown district.
Watercourses draining the city of Livermore include Arroyo Mocho, Arroyo del Valle, Arroyo Seco and Arroyo Las Positas. The principal aquifer underlying the city is the Mocho Subbasin. According to the United States Census Bureau, the city has a total area of 23.9 square miles (62.0 km²), all of it land. Several local seismicially active faults lie near the city including the Greenville Fault and the Tesla Fault.