Thonotosassa, FL has a population of 13,227 and is the 3,155th largest city in the United States. The population density is 499 per sq mi which is 70% higher than the Florida average and 451% higher than the national average. The median age in Thonotosassa is 43 which is approximately 2% higher than the Florida average of 42. In Thonotosassa, 54% of the population over 15 years of age are married, 88% speak English and 9% speak Spanish. 55% of Thonotosassa residents were born in Florida, 34% were born out of state, 3% were born outside of the United States and 8% were foreign born.