Numinbah Valley is a rural locality in the City of Gold Coast, Queensland, Australia. In the 2021 census, Numinbah Valley had a population of 212 people. The Numinbah Valley is a valley and locality in the Gold Coast hinterland in South East Queensland. This Scenic Rim valley covers 116 km² and contains cleared grazing land, rocky outcrops, waterfalls, raiā¦Numinbah Valley is a rural locality in the City of Gold Coast, Queensland, Australia. In the 2021 census, Numinbah Valley had a population of 212 people. The Numinbah Valley is a valley and locality in the Gold Coast hinterland in South East Queensland. This Scenic Rim valley covers 116 km² and contains cleared grazing land, rocky outcrops, waterfalls, rainforest walks and good hinterland scenery. Lonely Planet has described the valley as the most beautiful in South East Queensland.