Hollister, CA has a population of 36,901 and is the 1,132nd largest city in the United States. The population density is 5,032 per sq mi which is 2065% higher than the California average and 5454% higher than the national average. The median age in Hollister is 32 which is approximately 10% lower than the California average of 36. In Hollister, 55% of the population over 15 years of age are married, 55% speak English and 41% speak Spanish. 66% of Hollister residents were born in California, 10% were born out of state, 2% were born outside of the United States and 22% were foreign born.