AreaVibes reveals the best places to live in Oregon for 2016 using our Livability Score. The Livability Score for each city in Oregon is calculated out of 100 from a unique algorithm based on various metrics, including: amenities, cost of living, crime, education, employment, housing and weather. Oregon has a population of 3,900,343 and a population density of 39.6 people per square mile. The capital city is Salem and the largest city in Oregon is Portland. To filter the results, use the dropdown options to sort by population or category.