Smithfield is a suburb of Cairns in the Cairns Region, Queensland, Australia. In the 2021 census, Smithfield had a population of 6,664 people. Smithfield is about 15 kilometres to the north of Cairns City, Queensland, Australia. The Captain Cook Highway passes through Smithfield and the Kuranda Range Road branches from the Captain Cook Highway at S…Smithfield is a suburb of Cairns in the Cairns Region, Queensland, Australia. In the 2021 census, Smithfield had a population of 6,664 people. Smithfield is about 15 kilometres to the north of Cairns City, Queensland, Australia. The Captain Cook Highway passes through Smithfield and the Kuranda Range Road branches from the Captain Cook Highway at Smithfield.