Quartzsite, AZ has a population of 3,646 and is the 7,858th largest city in the United States. The population density is 100 per sq mi which is 75% higher than the Arizona average and 11% higher than the national average. The median age in Quartzsite is 71 which is approximately 91% higher than the Arizona average of 37. In Quartzsite, 86% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 0% of Quartzsite residents were born in Arizona, 97% were born out of state, 0% were born outside of the United States and 3% were foreign born.