The legal state of online casino gambling in Michigan Of the six legal online gambling states-New Jersey, Pennsylvania, Michigan, Delaware, West Virginia, and Connecticut-Michigan has the second-most residents at over 10,000,000, making it one of the premier spots for online casino play.īelow, we’ll review the best online casinos in the state, how to find a place to place, sign up, and more to get your Michigan online gambling journey started. WITH online sports betting now available in more than half of the United States, online casino play tends to go unnoticed as it’s available in just six states.