There is more than one place called Portland: Australia Portland (Victoria) – in Victoria (state) Jamaica Portland (Jamaica) – a parish on the northeast coast of Jamaica. United Kingdom Isle of Portland – a town (and not a true island) in Dorset, England United States of America Portland (Maine) – a city in New England, Portland is the largest city of Maine. Portland (Oregon) – a city in the Pacific Northwest, the largest city with the name and the largest city in Oregon. Named for Portland in Maine.