AreaVibes reveals the best places to live in Arizona for 2016 using our Livability Score. The Livability Score for each city in Arizona is calculated out of 100 from a unique algorithm based on various metrics, including: amenities, cost of living, crime, education, employment, housing and weather. Arizona has a population of 6,410,979 and a population density of 57.5 people per square mile. The capital city is Phoenix and the largest city in Arizona is Phoenix. To filter the results, use the dropdown options to sort by population or category.