Sports betting has become increasingly popular across the United States, with 39 states, including Washington D.C., offering some form of legalized U.S. sports betting. However, not all states have yet legalized it. The most recent attempt to legalize sports betting in Alaska, HB 145, was introduced on March 21, 2025, but there has been no forward motion or vote on the bill. Other states include Arizona, where sports betting was legalized on April 15, 2021, and launched on September 9, 2021. Colorado, where both retail and online launched on May 1, 2020, has the most of any state in the country, with 16 online sports books available. Delaware became the first state outside of Nevada to legalize sport betting, launching retail betting on July 5, 2018, and adding online sports betting on December 26, 2023. Georgia, where multiple attempts to legalize have failed, are seen as significant hurdles. There have been no proposed sports betting legislation in Idaho as of 2025.