The Greater Portland metropolitan area is home to over half a million people , more than one - third of Maine 's total population .
Portland is the most populous city in the U.S. state of Maine , with a population of 67,067 as of 2017 .
The city   metropolitan area is home to over half a million people , more than one - third of Maine 's total population .
Portland is the most populous city in the U.S. state of Maine , with a population of 67,067 as of 2017 .