Lake Mary Jane, FL has a population of 1,599 and is the 12,334th largest city in the United States. The population density is 304 per sq mi which is 4% higher than the Florida average and 236% higher than the national average. The median age in Lake Mary Jane is 49 which is approximately 18% higher than the Florida average of 42. In Lake Mary Jane, 70% of the population over 15 years of age are married, 71% speak English and 21% speak Spanish. 23% of Lake Mary Jane residents were born in Florida, 60% were born out of state, 0% were born outside of the United States and 17% were foreign born.