Lake Lakengren (lock-n-grin, a Viking name meaning “Lake of the emerald green hills”) is an unincorporated community and census-designated place in Gasper Township, Preble County, Ohio, United States. The population was 3,387 at the 2020 census. A private planned community located 3 mi southwest of Eaton, the northern portion of Lake Lakengren is served by Eaton Community Schools and the southern portion is served by the Preble Shawnee Local School District.

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