Cymmer is located in the lower Rhondda Valley about halfway between Treorchy and Pontypridd. It is situated on the A4119 road half a mile from its junction with the A4058 road.
Cymmer's location within the Rhondda Valley, midway between Treorchy and Pontypridd, provides a central position. Its proximity to the A4119 and A4058 roads facilitates access to the surrounding area.