Mullaley is a village on the Oxley Highway, 38 km west of Gunnedah. The Coxs Creek runs across the highway on the western side of the village. Mullaley is on the crossroads of the roads from Boggabri in the north, Premer in the south, Gunnedah in the east and Coonabarabran in the west. The surrounding area is part of the highly fertile Liverpool Plains region.