The largest city in Oregon, United States and the county seat of Multnomah County; named for the city in Maine. • The largest city in Maine, United States and the county seat of Cumberland County; named for the Isle of Portland. • Multiple smaller locales in the United States: • A town in Ashley County, Arkansas; named for its steamboat port. • An unincorporated community in Fremont County, Colorado; named for the local Portland cement industry. • A census-designated place in Ouray County, Colorado. • A town and census-designated place therein, in Middlesex County, Connecticut; named for the Isle of Portland. • An unincorporated community in Polk County, Georgia; named for the local Portland cement industry. • A township in Whiteside County, Illinois. • A city, the county seat of Jay County, Indiana; named for the city in Maine. • A township and census-designated place therein, in Cerro Gordo County, Iowa. • An unincorporated community in Sumner County, Kansas. • An unincorporated community in Adair County, Kentucky. • A neighborhood of Louisville, Kentucky. • A city and township in Ionia County, Michigan. • An unincorporated community in Callaway County, Missouri; named for its port. • A town in Chautauqua County, New York. • A minor city in Traill County, North Dakota. • An unincorporated community in Lebanon Township, Meigs County, Ohio. • A borough in Northampton County, Pennsylvania; named for the city in Maine. • A city in Sumner County and Robertson County, Tennessee. • A city in San Patricio County, Texas; named for the city in Maine. • A town in Dodge County, Wisconsin. • An unincorporated community in Portland, Dodge County and town of Waterloo, Jefferson County, Wisconsin. • A town and unincorporated community therein, in Monroe County, Wisconsin. • Some other townships, listed under Portland Township. • A civil parish with a town council on the Isle of Portland, Dorset, England, a tied island in the English Channel. • A locale in Australia: • A town in the City of Lithgow, New South Wales; named for the local Portland cement industry. • A city in Victoria; named for British politician William Cavendish-Bentinck, 3rd Duke of Portland. • A community in Rideau Lakes township, Ontario, Canada; named for the 3rd Duke of Portland. • A townland in County Tipperary, Ireland. • A parish of Jamaica. • A locality near Whangarei, Northland, New Zealand; named for the local Portland cement industry. • A sea area between the Isle of Portland and the coast of France. • A surname.