Mary Esther
- County:
- Okaloosa County
- County Seat:
- No
- Area (mi²):
- 1.455
- State:
- Florida
Mary Esther is a city located in Okaloosa County, Florida. Mary Esther has a 2026 population of 4,070. Mary Esther is currently declining at a rate of -1.14% annually but its population has increased by 1.9% since the most recent census, which recorded a population of 3,994 in 2020.