Portland commonly refers to Portland in the American state of Oregon, Portland in the American state of Maine, or the Isle of Portland in England.
 Portland, Maine
Portland is the largest city in Maine and is the site of the Peaks to Portland Swim. With a metro population of over 500,000, the Greater Portland area is home to more than one-third of Maine's total population.
 Portland, Oregon
Portland is a city located in the U.S. state of Oregon, near the confluence of the Willamette and Columbia rivers. It is the 29th most populous city in the United States. Portland is Oregon's most populous city, and the third most populous city in the Pacific Northwest region, after Seattle, Washington and Vancouver, British Columbia. It is site of the Portland Bridge Swim.
 Isle of Portland, England
The Isle of Portland is a limestone tied island, 6 kilometres (4 mi) long by 2.4 kilometres (1.5 mi) wide, in the English Channel. Portland is 8 kilometres (5 mi) south of the resort of Weymouth, forming the southernmost point of the county of Dorset, England. A barrier beach over which runs the A354 road connects it to Chesil Beach and the mainland. Portland and Weymouth together form the borough of Weymouth and Portland. The population of Portland is 12,400.