Otter is an unincorporated community in Paris Township, Union County, Ohio, United States. It is located at 40°16′33″N 83°25′09″W, just northwest of Marysville, on the banks of Otter Run, at the intersection of Dog Leg Road and Westlake-Lee Road.
Before 1900, there was a railroad station located here on the Western Division of the Toledo and Ohio Central Railway, but never a post office. The railroad station was discontinued on May 26, 1954.
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