Tropic is a town in Garfield County, Utah, United States, along Utah Scenic Byway 12. As of the 2020 census, the town had a population of 486. Tropic was founded in 1891. Tropic is in southern Garfield County along Utah Route 12, 7.5 miles southeast of Bryce Canyon City and 5 miles north of Cannonville. It is in the Tropic Valley, drained by the P…Tropic is a town in Garfield County, Utah, United States, along Utah Scenic Byway 12. As of the 2020 census, the town had a population of 486. Tropic was founded in 1891. Tropic is in southern Garfield County along Utah Route 12, 7.5 miles southeast of Bryce Canyon City and 5 miles north of Cannonville. It is in the Tropic Valley, drained by the Paria River, a tributary of the Colorado River.