Quartz Hill, CA has a population of 10,291 and is the 3,866th largest city in the United States. The population density is 2,735 per sq mi which is 1077% higher than the California average and 2919% higher than the national average. The median age in Quartz Hill is 40 which is approximately 11% higher than the California average of 36. In Quartz Hill, 57% of the population over 15 years of age are married, 83% speak English and 15% speak Spanish. 74% of Quartz Hill residents were born in California, 17% were born out of state, 1% were born outside of the United States and 8% were foreign born.