The monthly total was up 12.9% from the previous record of $499.2m set in December last year, with $558.7m bet online and the remaining $5.0m at retail sportsbooks.
Players won $521.8m from sports betting – $517.3m online and $4.5m from retail – which left $40.5m in gross revenue before free bets, up 4.9% from $38.6m in December.
After accounting for $20.9m worth of free bets and promotional credits, this left $19.6m in taxable revenue, an increase of 13.3% month-on-month. The state was also able to collect $2.0m in tax from sports betting in January.
Looking at individual operator performances, DraftKings remained in top spot with $173.1m in total wagers accepted, ahead FanDuel on $149.9m and BetMGM with $120.0m.
FanDuel ranked first for gross revenue, with the $11.9m generated in January marginally higher than FanDuel on $11.5m, while BetMGM placed third with $10.7m.
After taking away free bets, FanDuel was still top with $8.0in revenue, then DraftKings on $6.7m and BetMGM with $2.0m.