Granite Hills, CA has a population of 3,071 and is the 8,694th largest city in the United States. The population density is 1,107 per sq mi which is 332% higher than the California average and 1122% higher than the national average. The median age in Granite Hills is 52 which is approximately 45% higher than the California average of 36. In Granite Hills, 67% of the population over 15 years of age are married, 80% speak English and 14% speak Spanish. 51% of Granite Hills residents were born in California, 33% were born out of state, 0% were born outside of the United States and 16% were foreign born.