Northridge is 17 square miles (44 km2) in area and is approximately 807 feet (246 m) above sea level.
Adjacent neighborhoods include Granada Hills, Chatsworth, North Hills, Reseda, Porter Ranch, and Winnetka.
The community was founded in 1910 as Zelzah Station, a Southern Pacific depot town at the Colonel Henry Hubbard & "Bud" Wright Hawk Ranch north of Los Angeles.
Shortly after the Los Angeles City Aqueduct opened in 1913, Henry Hubbard became a member of the Aqueduct Board.
The following year Zelzah Grammar School opened and citizens formally voted for annexation to the City of Los Angeles and Owens River water rights in 1915.
William Mulholland, engineer of the mammoth project, lived nearby and maintained one of many large rancho tracts remaining from the Spanish, Mexican and Californio land grant days.
Zelzah Acres became the name of one of those early housing tracts carved from the former enormous Rancho Ex-Mission San Fernando lands joining nearby towns of Chatsworth Park, Lankershim, Owensmouth, San Fernando and Van Nuys.
The post office and train depot were renamed North Los Angeles in 1929 and finally Northridge in 1938.
http://en.wikipedia.org/wiki/Northridge,_Los_Angeles,_California