Longwood is a city in Seminole County, Florida, United States. It is part of the Orlando–Kissimmee–Sanford, Florida Metropolitan Statistical Area. The population was 15,087 at the 2020 census. With the advent of World War II, growth began to affect Longwood as military personnel flowed into the new Naval Air Station Sanford to the north and Orlando Army Air Base to the south. By the 1950s, NAS Sanford was being converted into a Master Jet Base for carrier-based heavy attack aircraft and, along with the re-designated Orlando Air Force Base and nearby Pinecastle AFB, saw even more military families renting or purchasing homes in and around Longwood. In 1959, the city had slightly over 1,000 residents and a city limit boundary that measured approximately 1-by-1-mile square. In 1960, Longwood Elementary School was constructed and opened inside the city limits.