The detainees will be set free on Monday and Tuesday, Lt. Col. Barry Johnson told The Associated Press.
Some 5,500 other detainees remain in custody, Johnson said. About 2,200 are held at Abu Ghraib, and 2,700 are being held at Camp Bucca near Umm Qasr in the far south of the country, he said.
Others are at smaller facilities around the country where they "are initially screened to determine whether they should be processed for detention or released," Johnson said.
Abu Ghraib was at the center of a scandal over allegations that American prison guards abused Iraqi detainees. The scandal came to light in April when photographs of hooded and naked prisoners were made public, provoking a torrent of international criticism.
U.S. authorities have released more than 2,000 detainees from Abu Ghraib in the last two months.