Altamont is an unincorporated community in Alameda County, California. It is located 7.5 miles (12 km) northeast of Livermore, at an elevation of 741 feet (226 m) in the Altamont Pass. Originally called The Summit, the name was changed to Altamont when the Central Pacific Railroad arrived in 1869.
History
Altamont is derived from its former name Alta Monte (Spanish for "High Mountain"). The community was also briefly known as The Summit.
A post office operated at Altamont from 1872 to 1955.
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