AreaVibes reveals the best places to live in Idaho for 2016 using our Livability Score. The Livability Score for each city in Idaho is calculated out of 100 from a unique algorithm based on various metrics, including: amenities, cost of living, crime, education, employment, housing and weather. Idaho has a population of 1,567,803 and a population density of 19.1 people per square mile. The capital city is Boise and the largest city in Idaho is Boise. To filter the results, use the dropdown options to sort by population or category.