Portland, ME has a population of 66,649 and is the 558th largest city in the United States. The population density is 3,093 per sq mi which is 8136% higher than the Maine average and 3314% higher than the national average. The median age in Portland is 36 which is approximately 19% lower than the Maine average of 44. In Portland, 41% of the population over 15 years of age are married, 85% speak English and 2% speak Spanish. 49% of Portland residents were born in Maine, 36% were born out of state, 1% were born outside of the United States and 13% were foreign born.