Marianna, FL has a population of 9,157 and is the 4,205th largest city in the United States. The population density is 545 per sq mi which is 86% higher than the Florida average and 502% higher than the national average. The median age in Marianna is 39 which is approximately 7% lower than the Florida average of 42. In Marianna, 48% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 64% of Marianna residents were born in Florida, 31% were born out of state, 0% were born outside of the United States and 4% were foreign born.