Casselberry
- County:
- Seminole County
- County Seat:
- No
- Area (mi²):
- 6.969
- State:
- Florida
Casselberry is a city located in Seminole County, Florida. Casselberry has a 2026 population of 31,650. Casselberry is currently growing at a rate of 2.42% annually and its population has increased by 9.36% since the most recent census, which recorded a population of 28,940 in 2020.