Thanks to stacks of oldfangled football parlay cards sold in supermarkets, Delaware has been in the sports betting business longer than any state outside of Nevada. This is almost fitting, given Delaware's distinction as the First State.
Through a nationwide prohibition on sports betting and some legal tossing and turning, the parlay cards persisted. And once that prohibition was struck down by the U.S. Supreme Court, Delaware's horse racetracks wasted no time opening brick-and-mortar sportsbooks in 2018.
Mobile betting would have to wait until 2023, when BetRivers launched its platform in an exclusive partnership with the Delaware Lottery. In spite of this monopoly and fierce competition from neighboring states, tiny Delaware handled $28.4 million in sports bets in December 2024, then an all-time monthly high.