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San Diego County, California

Photo: Rosecroft, ca. 1912, 530 Silvergate Avenue, San Diego, CA. Listed on the National Register of Historic Places in 2003. Photographed by user:Bruce Roberson (own work), 2012, [cc-by-3.0 (creativecommons.org/licenses/by/3.0)], via Wikimedia Commons, accessed June, 2014.

San Diego County Photo

The San Diego County courthouse is located at 220 West Broadway, San Diego, CA 92101; phone: 619‑450‑5700.

The San Diego County Administrative Center is located at 1600 Pacific Highway, San Diego, CA 92101; phone: 619‑236‑3771.

San Diego County Neighborhoods


Early settlement by Europeans in the area that now comprises San Diego County began about 1769 when Spanish explorers established the Mission San Diego de Alcala.

The county was created in 1850, coinciding with California's admission into the Union. The present county is much reduced from its original size which extended from the Pacific Ocean to the Colorado River.