Use our guide to legal NFL betting online for access to secure, reliable, and high quality options Illegal sports bets far exceed legal bets in the US because sports betting is largely illegal across the country. Best USA Online Sportsbooks. Get the top online betting sites to maximize your sports gambling excitement. GT Bets. #4. USA Flag GT Bets. Bonus: % up to $ 5/5. Read Review .. We cover the NFL, NBA, MLB, NHL, college basketball, college football, soccer. Football is widely considered to be the number one professional sport to In the United States, Nevada is the only state that offers traditional sportsbooks, and NFL betting accounts for over 40% of their entire sports betting industry. Back; Deposit Options · American Express · Bitcoin · Credit Card .. Best NFL Betting Sites.