Graig was historically referred to as 'Rhiw' (hill). The area is closely associated with coal mining and consists largely of terraced housing. Notable collieries within the area include - Gelli-whion (Gelliwion) Colliery, Newbridge Colliery (1844), Pen-y-rhiw (Penrhiw) Colliery (c1870) and Pontypridd Maritime Collieries (1841). Graig today is also home to the Dewi Sant Hospital.