Copperhead (Agkistrodon contortrix): Copperheads are found primarily in the eastern and central United States.
Cottonmouth or Water Moccasin (Agkistrodon piscivorus): Cottonmouths are semi-aquatic snakes found in the southeastern United States.
Timber Rattlesnake (Crotalus horridus): Timber rattlesnakes are found in the eastern United States, from Texas to New England.
Eastern Diamondback Rattlesnake (Crotalus adamanteus): Eastern diamondbacks are found in the southeastern United States, particularly in pine forests, sandy habitats, and coastal plains.
Western Diamondback Rattlesnake (Crotalus atrox): Western diamondbacks are found in the southwestern United States and northern Mexico.
Eastern Coral Snake (Micrurus fulvius): Eastern coral snakes are found in the southeastern United States, particularly in Florida.
Western Coral Snake (Micrurus tener): Western coral snakes are found in the southwestern United States and northern Mexico.
Mojave Rattlesnake (Crotalus scutulatus): Mojave rattlesnakes are found in the southwestern United States and northern Mexico.