O'Malley set the trial date at a hearing Tuesday morning.
The other five defendants are Cuyahoga County Common Pleas Judge Bridget McCafferty, Robert Rybak, Jerry Skuhrovec, Michael Gabor and William Neiheiser.
Since the investigation is ongoing, federal prosecutors say there are likely to be more charges against these defendants and new charges against new defendants as the case unfolds.
There are an estimated 100,000 documents and 1,000 hours of taped phone conversations for defense lawyers to review.
The normal speedy trial date would have brought the case to court on Nov. 24 of this year. But both federal prosecutors and defense lawyers argued it would take significantly more time to prepare for the case.
Attorneys for McCafferty and Skuhrovec said they may ask that their clients be tried separately from Dimora.
The government, however, wished all the cases be tried together. The trial is estimated to take at least eight weeks.
Other defendants received earlier trial dates for their cases.
Judge Steven Terry will be tried May 9 of next year.
Former Deputy Auditor Samir Mohammad will stand trial next April 18.
And Michael Gabor will face trial on separate charges Jan. 9, 2012.