This is the second state in which the Greenwood Gaming and Entertainment-owned casino operates online gambling, following its launch in Pennsylvania of online sports betting and casino on 24 June and 15 July, respectively.
The official launch follows a three-day soft opening period, which began on 4 October.
Dermot Smurfit, CEO at GAN, said: “Launching the largest casino in Pennsylvania online has now logically extended across the border into New Jersey, extending its reach into New Jersey's fast-growing and established internet gambling market.
“This represents an incremental revenue opportunity for GAN and is a logical extension of our technology infrastructure to serve Parx Casino patrons who routinely cross the invisible border between these two populous states."
GAN recently announced its Q3 gross operator revenue; rising 203% year-on-year to $80.9m.
Smurfit described this growth as “better than expected” and attributed it to mass-market US online sports bettors in New Jersey crossing over into the online casino before, during and after sporting events, and the faster-than-anticipated ramp-up of Pennsylvania online gamblers.