The City of El Cajon was incorporated on November 12, 1912, as a General Law City and by a vote of the people on June 5, 2012, became a Charter City, giving the City Council more local control of municipal affairs. El Cajon is located in Southern California, just 15 miles due east of San Diego and is the sixth largest of 18 cities in San Diego County. El Cajon City Hall is located at 200 Civic Center Way., El Cajon, CA 92020.