Zolfo Springs, FL has a population of 2,059 and is the 10,850th largest city in the United States. The population density is 1,179 per sq mi which is 302% higher than the Florida average and 1201% higher than the national average. The median age in Zolfo Springs is 26 which is approximately 37% lower than the Florida average of 42. In Zolfo Springs, 60% of the population over 15 years of age are married, 33% speak English and 67% speak Spanish. 62% of Zolfo Springs residents were born in Florida, 16% were born out of state, 1% were born outside of the United States and 21% were foreign born.