Texas Municipalities and communities of Seminole County, Florida, United StatesCounty seat: SanfordCities Altamonte Springs Casselberry Lake Mary Longwood Oviedo Sanford Winter Springs CDPs Black Hammock Chuluota Fern Park Forest City Geneva Goldenrod‡ Heathrow Midway Wekiwa Springs Unincorporatedcommunities Indian Mound Village Lake Monroe Sanlando Springs Slavia Taintsville Footnotes‡This populated place also has portions in an adjacent county or counties Florida portal United States portal Subcategories This category has the following 3 subcategories, out of 3 total. Census-designated places in Seminole County, Florida (9 P) Cities in Seminole County, Florida (2 C, 7 P) Unincorporated communities in Seminole County, Florida (9 P)