St. George, UT has a population of 78,573 and is the 445th largest city in the United States. The population density is 1,029 per sq mi which is 2958% higher than the Utah average and 1036% higher than the national average. The median age in St. George is 36 which is approximately 18% higher than the Utah average of 30. In St. George, 64% of the population over 15 years of age are married, 88% speak English and 10% speak Spanish. 51% of St. George residents were born in Utah, 41% were born out of state, 1% were born outside of the United States and 8% were foreign born.