New customers must also be at least 21 years old when signing up. To sign up at most legal operators you must be physically located in the state. But bordering neighbors like Kansas, Illinois, and Iowa have legal betting, which means many bettors in the Show-Me State can make a quick drive to place a wager. At this time, Missouri sports betting is currently not legal. Sports betting is usually done between a player and a sportsbook that sets the odds. When we talk about sports betting, we are not talking about making a friendly wager with one of your friends on a sports game.