It's March Madness and more people than ever can legally bet on basketball games

People in North Carolina may have a little more riding on this year's NCAA men's and women's basketball tournaments, as they will be able to legally bet on the games through their smartphone apps and computers for the first time.

For the sixth straight year, the number of states allowing legal sports betting has expanded since the last rendition of March Madness. A total of 38 states and the District of Columbia now allow some form sports betting, including 30 states and the nation's capital that allow online wagering.

That's up from one state, Nevada, where people could legally wager on games during the 2018 college basketball tournaments, before the U.S. Supreme Court cleared the way for expansion.

The rules for sports betting vary by state. Some states prohibit bets on home-state college teams or the performance of specific players. Others allow bets not only on the outcome of any college games but also on a variety of other things, such as the number of points, rebounds and assists that a particular player will tally.

Here are some things to know about sports betting as the tourneys open, with the men’s games starting Tuesday and the women’s competition beginning Wednesday.

BIG MONEY

Fans have long filled out NCAA tournament brackets while wagering in office pools or against friends and family. But those casual bets have increasingly been supplemented with more formal gambling.

The total amount bet on all sports through legal wagering sites exceeded $121 billion in 2023, up 30% from the previous year, according to the American Gaming Association. After paying out winnings, sports betting operators reaped $11 billion in revenue, up from about $7.5 billion the previous year.

The American Gaming Association estimates $2.7 billion will be bet this year on the NCAA men's and women's basketball tournaments through legal sports books.

“March Madness is the biggest kind of individual event of the year for sports betting,” said David Forman, the American Gaming Association vice president of research.

FILE - A customer makes a sports bet at the Borgata casino in Atlantic City N.J. on March 17, 2022 just before the March Madness NCAA college basketball tournament began. As March Madness gets underway, more people than ever now can legally bet on sports. A total of 38 states and the District of Columbia now allow some form of sports betting. (AP Photo/Wayne Parry, File)
A customer makes a sports bet at the Borgata casino in Atlantic City N.J. on March 17, 2022 just before the March Madness NCAA college basketball tournament began. (AP Photo/Wayne Parry, File) · ASSOCIATED PRESS

The Super Bowl also draws big bets, but it's only one game between two NFL teams. The NCAA Division 1 men's and women's basketball tournaments feature a total of 136 teams playing 134 games over three weeks.

CAN YOU BET ON YOUR TEAM?

Despite living where sports betting is legal, some fans still could be blocked from betting on their favorite teams and players.

Roughly a dozen states bar bets on college games involving home-state teams. Four additional states — Connecticut, Massachusetts, Rhode Island and Vermont — generally prohibit bets involving their own college teams but make exceptions for tournaments.