 According to the United States Census Bureau, the city has a total area of 4.9 square miles (12.7 km²), of which, 4.9 square miles (12.6 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.41%) is water.In 1854, Jacob Hamblin was called by Brigham Young to serve a mission to the southern Paiute and settled at Santa Clara in the vicinity of the modern city of St. George, Utah.The town is among the oldest in the area.