Mantua, UT has a population of 635 and is the 18,077th largest city in the United States. The population density is 129 per sq mi which is 285% higher than the Utah average and 43% higher than the national average. The median age in Mantua is 53 which is approximately 75% higher than the Utah average of 30. In Mantua, 68% of the population over 15 years of age are married, 93% speak English and 3% speak Spanish. 69% of Mantua residents were born in Utah, 25% were born out of state, 1% were born outside of the United States and 5% were foreign born.