"The 28 species and subspecies of the genus copose three distinct groups, the common, eastern woodchuck,Marmota momax, the Yellow Footed marmot= Marmota flaviventris and the hoary marmot or rock chuck Marmota caligata.
The woodchuck inhabits most of North America, ranging from the Atlantic west to Okalhoma and  orth from British Columbia to Alaska.
The Yellow footed marmot  inhabits the western United States, British Columbia  and Alaska. The Hoary marmot, or rockchuck ranges the mountains of Western North America and thrives in the Rocky Mountains" 
referenced the New Hunters Encyclopedia