Tropic is a town in Garfield County, Utah, United States, along Utah Scenic Byway 12. As of the 2000 census, the town had a total population of 508. Tropic was founded in 1891. According to the United States Census Bureau, the town has a total area of 8.4 Square miles (21.8 square kilometer), of which, 8.4 Square miles (21.7 Square kilometer) of it is land and 0.04 Square miles (0.1 Square kilometer) of it is water. The total area is 0.24% water.