Lancaster is a charter city in northern Los Angeles County, in the Antelope Valley of the western Mojave Desert in Southern California. As of 2013, Lancaster was the 31st largest city in California. Lancaster is part of a twin city complex with its southern neighbor Palmdale and together they are the principal cities within the Antelope Valley region and California's High Desert.
Lancaster is located approximately north (by highway) of downtown Los Angeles, near the Kern County line. It is separated from the Los Angeles Basin by the San Gabriel Mountains to the south, and from Bakersfield and the San Joaquin Valley by the Tehachapi Mountains to the north. The population of Lancaster grew from 37,000 at the time of its incorporation in 1977 to over 156,000 in 2010. According to the Greater Antelope Valley Economic Alliance report of 2013, the Palmdale / Lancaster urban area has a population of 513,547.