Rocklin, CA has a population of 60,509 and is the 636th largest city in the United States. The population density is 3,059 per sq mi which is 1216% higher than the California average and 3277% higher than the national average. The median age in Rocklin is 38 which is approximately 5% higher than the California average of 36. In Rocklin, 60% of the population over 15 years of age are married, 84% speak English and 7% speak Spanish. 65% of Rocklin residents were born in California, 22% were born out of state, 1% were born outside of the United States and 11% were foreign born.