Gilroy, CA has a population of 52,576 and is the 764th largest city in the United States. The population density is 3,257 per sq mi which is 1302% higher than the California average and 3495% higher than the national average. The median age in Gilroy is 34 which is approximately 7% lower than the California average of 36. In Gilroy, 54% of the population over 15 years of age are married, 54% speak English and 39% speak Spanish. 62% of Gilroy residents were born in California, 12% were born out of state, 1% were born outside of the United States and 25% were foreign born.