Horse racing betting is legal in 41 U.S. states. Most racebooks are licensed to operate in particular U.S. states meaning that a legal betting site in your state could be banned in another. Certain U.S. states such as Arizona, Nevada, Alaska, and Utah have passed laws that make horse racing illegal. Before signing up with a horse racing betting site, be sure to check our horse racing betting guide at Betastic to find out which sites are legal in your state.