A wide range of rattlesnakes live across the U.S. and North America, and some varieties live in South America as well. There are 36 identified species of rattlesnakes as of 2014. Each distinct species has its own range.
Some of the highest population densities of rattlesnakes are found in the forests along the Eastern Seaboard and the deserts of the Southwest region of the U.S. This branch of venomous snakes is not native to any other continents. Despite the toxic venom resent in rattlesnake fangs, the Arizona Game and Fish Department estimates that less than 1 percent of bites to humans end in death.