Portland, OR has a population of 620,589 and is the 27th largest city in the United States. The population density is 4,650 per sq mi which is 11642% higher than the Oregon average and 5032% higher than the national average. The median age in Portland is 37 which is approximately 6% lower than the Oregon average of 39. In Portland, 46% of the population over 15 years of age are married, 81% speak English and 7% speak Spanish. 40% of Portland residents were born in Oregon, 45% were born out of state, 1% were born outside of the United States and 14% were foreign born.