Phoenix, AZ has a population of 1,555,324 and is the 6th largest city in the United States. The population density is 3,005 per sq mi which is 5126% higher than the Arizona average and 3216% higher than the national average. The median age in Phoenix is 33 which is approximately 10% lower than the Arizona average of 37. In Phoenix, 46% of the population over 15 years of age are married, 63% speak English and 31% speak Spanish. 41% of Phoenix residents were born in Arizona, 38% were born out of state, 1% were born outside of the United States and 20% were foreign born.