Casino at Ocean Downs, Hollywood Casino Perryville and Rocky Gap Casino Resort all posted increases in the month, while Maryland Live and Horseshoe Casino Baltimore saw year-over-year declines.
Maryland Live is the closest competitor to MGM, which sits along the Potomac River in Prince George's County. MGM brought in $50.1 million in June.
Horseshoe generated $22.1 million, a decrease of 9.6 percent over June 2016.
Hollywood Casino Perryville brought in $6.3 million, up 5.8 percent. Rocky Gap posted revenue of $4.5 million, an increase of 8.6 percent. Casino at Ocean Downs generated $5.5 million, up 9.5 percent year-over-year.