The U.S. Supreme Court overturned a ban on sports betting in most states on May 14 Four states — New Jersey, Delaware, Mississippi and West Virginia — have joined Nevada in offering legalized sports betting since And more than 20 states are looking to legalize it when their legislatures convene next year. Research firm Eilers & Krejcik Gaming predicts 44 states will have approved sports betting by 2023. Credit Suisse expects U.S. sports betting net revenues to surge to $4.5 billion by 2023