Mary Esther, FL has a population of 4,177 and is the 7,250th largest city in the United States. The population density is 2,837 per sq mi which is 866% higher than the Florida average and 3031% higher than the national average. The median age in Mary Esther is 47 which is approximately 14% higher than the Florida average of 42. In Mary Esther, 61% of the population over 15 years of age are married, 88% speak English and 6% speak Spanish. 27% of Mary Esther residents were born in Florida, 60% were born out of state, 3% were born outside of the United States and 10% were foreign born.