Holtville, CA has a population of 6,230 and is the 5,611th largest city in the United States. The population density is 5,411 per sq mi which is 2228% higher than the California average and 5872% higher than the national average. The median age in Holtville is 29 which is approximately 18% lower than the California average of 36. In Holtville, 58% of the population over 15 years of age are married, 26% speak English and 74% speak Spanish. 64% of Holtville residents were born in California, 4% were born out of state, 0% were born outside of the United States and 31% were foreign born.