School officials have said the plan, which was approved at a Monday night school board meeting, is needed to remove thousands of empty seats and generate more state funding for the system.
The move will free up an estimated $12.4 million a year, school officials said.
The vote was controversial, and school officials added security at Monday's meeting. Participants had to walk through metal detectors, and their belongings were searched.
Technical difficulties hampered the school board and participants at the meeting, the Atlanta Journal-Constitution reported.
A power outage meant the first part of the meeting was not broadcast live as planned. Also, the board room was only partially lit and microphones didn't work at the start of the meeting.
Full power was restored after two hours, but was disrupted again during a passionate speech against the rezoning plan.
The school system, which serves about 100,000 students, is the third-largest in the state.