Mary Esther is a city in Okaloosa County, Florida, United States. It is part of the Crestview–Fort Walton Beach–Destin, Florida Metropolitan Sta…Mary Esther is a city in Okaloosa County, Florida, United States. It is part of the Crestview–Fort Walton Beach–Destin, Florida Metropolitan Statistical Area. The population was 3,982 at the 2020 US census, up from 3,851 at the 2010 census.
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