Centennial, California is a proposed 12,323-acre (49.87 km2) master-planned community on Tejon Ranch, in Los Angeles County between Bakersfield and Los Angeles.  It is sited in the far western Antelope Valley at the foothills of the Sierra Pelona and Tehachapi Mountains. It is planned to be located along California State Route 138 east of Interstate 5, and northeast of Quail Lake.
The community is intended to be built over 25 to 30 years, with approximately one-half of the 11,700-acre area designated as open space. It comprises 19,333 houses, including single- and multifamily structures, designed for 76,000 people. The developers have said they plan to attract local jobs in order to employ the anticipated number of adult residents.
The project lies between a point about a mile east of the intersection of Interstate 5 and California Highway 138 eastward past Quail Lake into the western Antelope Valley to about 280th Street West.
The Center for Biological Diversity, based in Tucson, Arizona, has opposed the housing project, claiming that it would be built on rare ecosystems, including the largest native grassland left in California. The project is planned on the territory inhabited by the endangered California condor, as well as 26 other species.
Concerns of those attending included possible traffic congestion on Interstate 5 and California Highway 138, an increase of valley fever caused by the release of dust-borne spores during construction, insufficient water supply and "poorly designed" wildlife corridors.
- Patric Hedlund, "'Huge' Step for Tejon's Centennial Plan." The Mountain Enterprise, November 28, 2014, page 13
- Patric Hedlund, "Centennial Hearing at Gorman School Thursday, 6 P.M.," The Mountain Enterprise, June 30, 2017, page 6
- LA Curbed: "Tejon Ranch Project Could Affect 27 Plants and Animals" (with map); 3 February 2012.
- Jon Gertner (2007-03-18). "Playing Sim City For Real". New York Times. Retrieved 2009-07-17.
- Scott Gold, "Stoic little town faces tomorrow; A massive housing project may mean the end for Neenach, in the Antelope Valley," Los Angeles Times, February 29, 2008
- Patric Hedlund, "Water, Traffic, Valley Fever, Wildlife, Poor Outreach Raised at Thinly Attended Centennial Hearing," The Mountain Enterprise, July 7, 2017, page 1]