Isla Vista, CA has a population of 27,179 and is the 1,590th largest city in the United States. The population density is 14,692 per sq mi which is 6222% higher than the California average and 16117% higher than the national average. The median age in Isla Vista is 21 which is approximately 43% lower than the California average of 36. In Isla Vista, 5% of the population over 15 years of age are married, 63% speak English and 17% speak Spanish. 69% of Isla Vista residents were born in California, 13% were born out of state, 2% were born outside of the United States and 16% were foreign born.