Eustis, FL has a population of 19,661 and is the 2,216th largest city in the United States. The population density is 1,879 per sq mi which is 540% higher than the Florida average and 1974% higher than the national average. The median age in Eustis is 40 which is approximately 3% lower than the Florida average of 42. In Eustis, 53% of the population over 15 years of age are married, 84% speak English and 12% speak Spanish. 45% of Eustis residents were born in Florida, 44% were born out of state, 3% were born outside of the United States and 8% were foreign born.