At present, the Nevada, Arkansas, Mississippi, West Virginia, Pennsylvania, Delaware, New Jersey States have legalized sports betting in the United States but, not all have yet start accepting wagers.
Nevada gives you the richest legalized sports betting experience in the US. Your next best choice is New Jersey where both land-based casino and online sportsbooks offer sports betting. For single sports betting, Parley betting on NFL and college games Delaware is best choice.
In West Virginia, enjoy sports betting at Hollywood casino. While in NY you can bet in-person at Indian casinos, Online horse racing and Greyhound racing, offshore Online sports betting sites. Rode Island is expected to join soon.