Atlantis, FL has a population of 2,239 and is the 10,404th largest city in the United States. The population density is 1,620 per sq mi which is 452% higher than the Florida average and 1688% higher than the national average. The median age in Atlantis is 61 which is approximately 46% higher than the Florida average of 42. In Atlantis, 71% of the population over 15 years of age are married, 85% speak English and 10% speak Spanish. 25% of Atlantis residents were born in Florida, 59% were born out of state, 0% were born outside of the United States and 16% were foreign born.