| Oreamnos americanus | Mountain Goat | Mammalia | Bovidae | C |
| Ovis canadensis | Bighorn Sheep | Mammalia | Bovidae | C |
| Alces alces | Moose | Mammalia | Cervidae | C |
| Cervus canadensis | Elk, Wapiti, American Elk | Mammalia | Cervidae | C |
| Odocoileus hemionus | Mule Deer | Mammalia | Cervidae | C |
| Odocoileus virginianus ochrourus | White-tailed Deer | Mammalia | Cervidae | C |
| Canis latrans | Coyote | Mammalia | Canidae | C |
| Canis lupus | Wolf, Grey Wolf, Gray Wolf, Timber Wolf | Mammalia | Canidae | C |
| Vulpes vulpes | Red Fox | Mammalia | Canidae | TBD |
| Felis catus | Domestic Cat, Feral Cat | Mammalia | Felidae | C |
| Lynx canadensis | Canada Lynx | Mammalia | Felidae | C |
| Lynx rufus | Bobcat | Mammalia | Felidae | C |
| Puma concolor | Cougar, Puma, Mountain Lion | Mammalia | Felidae | C |
| Mephitis mephitis | Striped Skunk | Mammalia | Mephitidae | C |
| Gulo gulo | Wolverine | Mammalia | Mustelidae | TBD |
| Lontra canadensis | Northern River Otter, River Otter, North American River Otter | Mammalia | Mustelidae | C |
| Martes caurina | Pacific Marten | Mammalia | Mustelidae | P |
| Mustela richardsonii | Ermine, Short-tailed Weasel, American Ermine, American Stoat | Mammalia | Mustelidae | C |
| Neogale frenata | Long-tailed Weasel | Mammalia | Mustelidae | C |
| Neogale vison | American Mink | Mammalia | Mustelidae | C |
| Pekania pennanti | Fisher | Mammalia | Mustelidae | TBD |
| Taxidea taxus | American Badger | Mammalia | Mustelidae | C |
| Procyon lotor | Raccoon, Northern Raccoon, Common Raccoon | Mammalia | Procyonidae | C |
| Ursus americanus | Black Bear | Mammalia | Ursidae | C |
| Ursus arctos | Grizzly Bear, Brown Bear | Mammalia | Ursidae | C |
| Antrozous pallidus | Pallid Bat | Mammalia | Vespertilionidae | TBD |
| Corynorhinus townsendii | Townsend's Big-eared Bat | Mammalia | Vespertilionidae | P |
| Eptesicus fuscus | Big Brown Bat | Mammalia | Vespertilionidae | C |
| Euderma maculatum | Spotted Bat | Mammalia | Vespertilionidae | P |
| Lasionycteris noctivagans | Silver-haired Bat | Mammalia | Vespertilionidae | C |
| Lasiurus cinereus | Hoary Bat | Mammalia | Vespertilionidae | C |
| Myotis californicus | California Myotis | Mammalia | Vespertilionidae | C |
| Myotis ciliolabrum | Western Small-footed Bat | Mammalia | Vespertilionidae | P |
| Myotis evotis | Long-eared Myotis, Miller's Myotis | Mammalia | Vespertilionidae | C |
| Myotis lucifugus | Little Brown Bat, Little Brown Myotis | Mammalia | Vespertilionidae | C |
| Myotis thysanodes | Fringed Myotis | Mammalia | Vespertilionidae | P |
| Myotis volans | Long-legged Myotis | Mammalia | Vespertilionidae | C |
| Myotis yumanensis | Yuma Myotis | Mammalia | Vespertilionidae | C |
| Sorex cinereus | Cinereus Shrew, Masked Shrew | Mammalia | Soricidae | C |
| Sorex merriami | Merriam's Shrew | Mammalia | Soricidae | TBD |
| Sorex monticolus | Dusky Shrew, Montane Shrew | Mammalia | Soricidae | C |
| Sorex navigator | Western Water Shrew | Mammalia | Soricidae | C |
| Sorex preblei | Preble's Shrew, Malheur Shrew | Mammalia | Soricidae | TBD |
| Sorex vagrans | Vagrant Shrew | Mammalia | Soricidae | C |
| Lepus americanus | Snowshoe Hare, Varying Hare | Mammalia | Leporidae | C |
| Sylvilagus nuttallii | Mountain Cottontail, Nuttall's Cottontail | Mammalia | Leporidae | TBD |
| Ochotona princeps | Common Pika, American Pika | Mammalia | Ochotonidae | C |
| Equus caballus | Domestic Horse, Feral Horse | Mammalia | Equidae | M |
| Homo sapiens | Human | Mammalia | Hominidae | C |
| Aplodontia rufa | Mountain Beaver | Mammalia | Aplodontiidae | M |
| Castor canadensis | North American Beaver, Beaver, Canadian Beaver | Mammalia | Castoridae | C |
| Microtus longicaudus | Long-tailed Vole | Mammalia | Cricetidae | C |
| Microtus montanus | Montane Vole | Mammalia | Cricetidae | C |
| Microtus pennsylvanicus | Meadow Vole | Mammalia | Cricetidae | C |
| Myodes gapperi | Southern Red-backed Vole | Mammalia | Cricetidae | C |
| Neotoma cinerea | Bushy-tailed Woodrat | Mammalia | Cricetidae | C |
| Ondatra zibethicus | Muskrat | Mammalia | Cricetidae | C |
| Peromyscus sonoriensis | Western Deer Mouse | Mammalia | Cricetidae | C |
| Phenacomys intermedius | Western Heather Vole | Mammalia | Cricetidae | P |
| Reithrodontomys megalotis | Western Harvest Mouse | Mammalia | Cricetidae | C |
| Synaptomys borealis | Northern Bog Lemming | Mammalia | Cricetidae | TBD |
| Zapus hudsonius | Meadow Jumping Mouse | Mammalia | Dipodidae | C |
| Zapus princeps | Western Jumping Mouse | Mammalia | Dipodidae | C |
| Zapus trinotatus | Pacific Jumping Mouse | Mammalia | Dipodidae | TBD |
| Erethizon dorsatum | North American Porcupine | Mammalia | Erethizontidae | C |
| Thomomys talpoides | Northern Pocket Gopher | Mammalia | Geomyidae | C |
| Perognathus parvus laingi | Great Basin Pocket Mouse | Mammalia | Heteromyidae | C |
| Mus musculus | House Mouse | Mammalia | Muridae | C |
| Rattus norvegicus | Brown Rat, Norway Rat | Mammalia | Muridae | C |
| Rattus rattus | Roof Rat, Black Rat | Mammalia | Muridae | C |
| Callospermophilus lateralis | Golden-mantled Ground Squirrel | Mammalia | Sciuridae | C |
| Glaucomys oregonensis | Humboldt's Flying Squirrel | Mammalia | Sciuridae | P |
| Glaucomys sabrinus | Northern Flying Squirrel | Mammalia | Sciuridae | C |
| Marmota caligata | Hoary Marmot | Mammalia | Sciuridae | TBD |
| Marmota flaviventris | Yellow-bellied Marmot | Mammalia | Sciuridae | C |
| Neotamias amoenus | Yellow-pine Chipmunk | Mammalia | Sciuridae | C |
| Neotamias minimus | Least Chipmunk | Mammalia | Sciuridae | M |
| Sciurus carolinensis | Eastern Gray Squirrel | Mammalia | Sciuridae | C |
| Sciurus niger | Eastern Fox Squirrel | Mammalia | Sciuridae | TBD |
| Tamiasciurus hudsonicus | American Red Squirrel, Red Squirrel, Chickaree, Pine Squirrel | Mammalia | Sciuridae | C |
| Urocitellus columbianus | Columbian Ground Squirrel | Mammalia | Sciuridae | C |