Millions could place legal bets on the Super Bowl. Just not in California or Missouri

California and Missouri are two of a dozen states that haven't legalized sports betting.

The U.S. Supreme Court struck down a nationwide ban on sports betting outside of Nevada in 2018 .

Thirty-eight states and Washington , D.C. have legal sports betting operations; several others are considering measures to allow it.

The American Gaming Association estimates 42.7 million Americans will bet on this year 's Super Bowl .

California and Missouri will miss out on legal sports betting revenue during this year 's Super Bowl .

Last February , Kansas sportsbooks reported no revenue from in-person sports betting for the month and just $35,000 in revenue from online bets.

States have collected more than $4.3 billion in tax revenue since the Supreme Court lifted sports betting ban in 2018 .