Workers were told the closing date is Sept. 16 or shortly thereafter.
The Atlantic Club closed in January, putting 1,700 people out of work. In June, Revel, Atlantic City's newest casino, filed for bankruptcy for the second time since it opened in 2010 with executives saying it could close if it cannot find a buyer, and Caesars Entertainment sent warning letters to the 2,000 employees of its Showboat Hotel and Casino.
Trump Entertainment filed for bankruptcy in 1991, 2004 and 2009. Donald Trump resigned as chairman of the board in 2009.
Atlantic City had a monopoly on many forms of legal gambling when the first casinos opened there more than 30 years ago. But revenues have dropped sharply in recent years because of competition from casinos in Connecticut and Pennsylvania.