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El Cajon, CA, population 92,487, is located in California's San Diego county, about 12.6 miles from San Diego and 12.8 miles from Chula Vista. Reference: http://www.idcide.com/citydata/ca/el-cajon.htm
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San Diego, CA is 372.4 sq miles (964.5 km²).
San Diego consists of 324.3 square miles.