Lancaster is a charter city in northern Los Angeles County, in the Antelope Valley of the western Mojave Desert in Southern California, United States. As of the 2020 census, the population was 173,516, making Lancaster the 158th-most populous city in the United States and the 30th most populous in California.

ZIP Codes: 93534–93536, 93539, 93584
Population: 167,426 (2024)
Area Code: 661
Elevation: 2,359 ft (719 m)
Incorporated: November 22, 1977