Atlantis is a city in Palm Beach County, Florida, United States. It is part of the Miami metropolitan area of South Florida. As of the 2020 census…Atlantis is a city in Palm Beach County, Florida, United States. It is part of the Miami metropolitan area of South Florida. As of the 2020 census, the city had a population of 2,142. The modern history of what became known as the city of Atlantis originates in a ranch called Mulberry Farms, owned by Philip D. Lewis, a former Florida state senator. Lewis's Mission Company raised Brahman cattle on the land. In 1958, real estate developers Nathan Hunt and Paul Kintz purchased the land, and began the construction of what became a gated golf and country club community. The residential development, combined with a small amount of adjacent land for commercial use, was incorporated on June 19, 1959. Its first council was appointed, consisting of James Kintz as mayor, Nathan Hunt as vice mayor, and councilmen Paul Kintz, Marjorie Hunt and William Blakeslee.