The Washington, D.C. area has four sportsbooks at stadiums or arenas, more than any other market in the U.S.

News website Axios pointed out that phenomenon, noting there are seven other in-venue sportsbooks either opened or planned across four cities – three in Phoenix, two in Chicago and one each in Cleveland and New York.

If you’re wondering, in-venue sportsbooks are prohibited in Nevada, meaning T-Mobile Arena and Allegiant Stadium can’t be part of the lineup. The State’s Gaming Control Act requires sportsbooks only be located in and operated by a non-restricted gaming licensee – the term for a full-scale casino.

In reporting on the partnership between the NFL’s Washington Commanders and Fanatics, which opened its first sportsbook at the team’s FedEx Field in Landover, Maryland, Axios noted the other arena sportsbooks in the vicinity of the nation’s capital. FedEx Field is 12 miles from Capitol Hill.

Caesars Sportsbook – when it was known as William Hill U.S. – opened the first Washington, D.C. sportsbook at the Capital One Arena, home to the NHL’s Washington Capitals, the NBA’s Washington Wizards and WNBA’s Washington Mystics.

BetMGM opened a sportsbook last year attached to Nationals Park, home of Major League Baseball’s Washington Nationals. Audi Field, a soccer venue for D.C. United of the MLS and the National Women’s Soccer League Washington Spirit, has a sportsbook operated by FanDuel.