Jennings, FL has a population of 590 and is the 18,538th largest city in the United States. The population density is 203 per sq mi which is 31% lower than the Florida average and 124% higher than the national average. The median age in Jennings is 35 which is approximately 16% lower than the Florida average of 42. In Jennings, 66% of the population over 15 years of age are married, 68% speak English and 32% speak Spanish. 47% of Jennings residents were born in Florida, 39% were born out of state, 0% were born outside of the United States and 13% were foreign born.