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is a city in Seminole County, Florida, United States. The population was 22,629 at the 2000 census. According to the U.S Census estimates of 2006, the city had a population of 24,647. It is usually considered a suburb in the Orlando–Kissimmee Metropolitan Statistical Area.
According to the United States Census Bureau, the city has a total area of 18.4 km² (7.1 mi²). 17.2 km² (6.7 mi²) of it is land and 1.1 km² (0.4 mi²) of it (6.06%) is water.
Casselberry features over 30 lakes and ponds, the largest being Lake Howell, the Triplet Chain of Lakes, Lake Kathryn, and Lake Concord.