DHA Phase 3 exists in two parts which are more than 5 kilometers apart from each other.
Original DHA 3 entrance exists 600 feet away from gate 3 of DHA phase 2, and across the DHA 2 on GT Road in the direction towards gate 2.
The Municipal Corporation Cooperative Housing Society Ltd. Rawat Rawalpindi (also called New Pindi Housing Society), which was originally started in 1980, was merged into DHAI Phase 3. This part of DHA 3 is located on main GT Road on the outskirts of Rawat after Kallar Syedan Road Chowk, and is on right hand while going to Lahore from Rawalpindi, opposite to Police Foundation Housing Society Rawat.
Maps of DHA Phase 3 are available here.