Only Nevada, Delaware, Montana and Oregon already allow sports betting and Nevada is the only state to allow single-game wagering. A report from Eilers & Krejcik Gaming predicts 14 states could have legalized sports gambling within two years including New Jersey, Mississippi, Michigan, Pennsylvania and Connecticut. For now however, it is still illegal in the 46 states not mentioned previously, but the . When it comes to betting sports online in the United States, there are both federal and state laws that come into play. Perhaps the most known type of state gambling laws are ages. The legal age to bet on sports within a state is decided by the local state government. States With Legal Sports Betting Available There is no more popular facet of gambling than wagering on sports, that is the simple truth. There is a reason that millions of dollars are wagered every year in the U.S. on a variety of different sports both inside the U.S. and abroad.