Portland is the most populous city in the U.S. state of Maine. Its population was 68,408 at the 2020 census. The Greater Portland metropolitan area has a population of approximately 550,000 people, the most populous metropolitan area in Maine. It is the county seat of Cumberland County. Historically tied to commercial shipping, the marine economy, and light industry, Portland's economy in the 21st century relies mostly on the service sector. The Port of Portland is the second-largest tonnage seaport in the New England area as of 2019.