Otter is an unincorporated community in Paris Township, Union County, Ohio, United States. It is located at , just northwest of Marysville, on the banks of Otter Run, at the intersection of Dog Leg Road and Westlake-Lee Road.Rand McNally, The Road Atlas '06, Chicago, 2006, p. 78.
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."A B C Pathfinder Shipping and Mailing Guide". New England Railway Publishing Company. 1899. Pg. 531. The railroad station was discontinued on May 26, 1954."Annual Report of the Public Utilities Commission of Ohio to the Governor of the State of Ohio for the Year 1954". Public Utilities Commission of Ohio. The Commission. 1954. Pg. 208
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