Calexico, CA has a population of 39,750 and is the 1,040th largest city in the United States. The population density is 4,605 per sq mi which is 1882% higher than the California average and 4983% higher than the national average. The median age in Calexico is 33 which is approximately 10% lower than the California average of 36. In Calexico, 53% of the population over 15 years of age are married, 4% speak English and 95% speak Spanish. 49% of Calexico residents were born in California, 2% were born out of state, 3% were born outside of the United States and 46% were foreign born.