El Cajon is a city in San Diego County, California, United States, 17 mi east of downtown San Diego. The city takes its name from Rancho E…El Cajon is a city in San Diego County, California, United States, 17 mi east of downtown San Diego. The city takes its name from Rancho El Cajón, which was named for the box-like shape of the valley that surrounds the city, and the origin of the city's common nickname "the Box".
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