Kayaking on Flagstaff lake with Bigelow mountains in back Welcome to Stratton-Eustis! Eustis and Stratton are both in Franklin County. Eustis and Stratton together have a population of about 618 as of the 2010 census. Eustis is located on the High Peaks Scenic Byway and Stratton near the 500-acre Flagstaff Lake
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