This was a rise of 7.9% from May 2021, in the earlier stages of recovery from the Covid-19 pandemic.
Slots continued to generate the most gross gaming revenue (GGR) overall, at $2.94bn, down just 0.1% year-on-year.
GGR from table games amounted to $873.9m, a rise of 10.5% year-on-year, while sports betting revenue came to $487.5m- up significantly by 78.2%.
Online gaming revenue also grew, by 30.9% to $406.4m.
For the year to date, total GGR is $24.39bn, up 20.6% from the same period in 2021.
Slots revenue for the year so far increased by 11% to $14.08bn and table games revenue grew by 38.2% to $4.05bn.
Sports betting revenue for the year to date jumped by 73.5% to $2.64bn. Online gaming GGR also grew significantly to $2.03bn, up by 45.6%.
The AGA also noted that March, April and May have been the three most successful months for gaming in industry history, with each surpassing $5bn in revenue.
In May the AGA reported the highest ever first quarter for commercial gaming revenue.