Portland is the most populous city in the U.S. state of Maine and the seat of Cumberland County. Portland's population was 66,215 as of 2019. The Greater Portland metropolitan area is home to over half a million people, the 105th-largest metropolitan area in the United States. Portland's economy relies mostly on the service sector and tourism. The Old Port district is known for its 19th-century architecture and nightlife. Marine industry still plays an important role in the city's economy, with an active waterfront that supports fishing and commercial shipping. The Port of Portland is the largest tonnage seaport in New England.