There are some key factors that you should consider when hunting out the best online sportsbooks. These are some of the most pro basketball spreads important criteria we use when gauging the quality of online betting sites: Same game parlays wildly popular in standalone NFL and NBA games. Online sports betting is legal in more than 20 different states: Arizona, Arkansas, Colorado, Connecticut, Illinois, Indiana, Iowa, Kansas, Louisiana, Maryland, Michigan, Montana, Nevada, New Hampshire, New Jersey, New York, Ohio, Oregon, Pennsylvania, Rhode Island, Tennessee, Virginia, West Virginia and Wyoming. You can download sports betting apps in those states, or use an online sportsbook website. Other states, such as Mississippi, North Carolina and Washington State, currently permit retail sports betting only.