Betula papyrifera is a species of birch native to northern North America.Betula papyrifera has a wide range. It is found in interior and southcentral Alaska and in all provinces and territories of Canada, except Nunavut, as well as the northern continental United States, south to Pennsylvania and Washington, with small isolated populations further south in mountains to North Carolina and Colorado. The most southerly stand in the Western United States is located in Lost Gulch in the City of Boulder Mountain Parks, an isolated Pleistocene relict that most likely reflects the southern reach of boreal vegetation into the area during the last Ice Ages.