Fullerton () is a city located in northern Orange County, California, United States. As of the 2010 census, the city had a total population of 135,161.
Fullerton was founded in 1887. It secured the land on behalf of the Atchison, Topeka and Santa Fe Railway. Historically it was a center of agriculture, notably groves of Valencia oranges and other citrus crops; petroleum extraction; transportation; and manufacturing. It is home to numerous higher educational institutions, particularly California State University, Fullerton and Fullerton College. From the mid-1940s through the late 1990s, Fullerton was home to a large industrial base made up of aerospace contractors, canneries, paper products manufacturers, and is considered to be the birthplace of the electric guitar, due in a large part to Leo Fender. The headquarters of Vons, which is owned by Albertsons, is located in Fullerton near the Fullerton-Anaheim line.
Evidence of prehistoric animal habitation, such as saber-toothed cats and mammoths, is present in Ralph B. Clark Regional Park in the northwest of the city. Europeans first passed through the area in 1769 when Gaspar de Portolà led a Spanish expedition north to Monterey. From the description recorded in the diary of Father Juan Crespi, it seems likely that the party camped on July 29 near present-day Laguna Lake, in the Sunny Hills area.
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