El Cajon, CA has a population of 102,894 and is the 298th largest city in the United States. The population density is 7,103 per sq mi which is 2957% higher than the California average and 7740% higher than the national average. The median age in El Cajon is 34 which is approximately 5% lower than the California average of 36. In El Cajon, 50% of the population over 15 years of age are married, 57% speak English and 20% speak Spanish. 49% of El Cajon residents were born in California, 20% were born out of state, 2% were born outside of the United States and 29% were foreign born.