Hitting a deer on the road can be terrible. Your car can suffer terrible damage and there's a real risk of losing control and crashing. And, from the deer's point of view, it's also a decidedly unpleasant occurence.
How likely are you to hit a deer over the course of a year of driving? According to the insurance company State Farm, West Virginia is the riskiest state with a likelihood of 1 in 40. You're probably safe in Hawaii, where it's 1 in 6,801. In the state of New York, it's 1 in 141, so be careful when cruising through Brooklyn.