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Jumbo had its start in 1881 when Walter Blansfield opened a store there. A post office was established at Jumbo in 1883, and remained in operation until 1901. The community was named after Jumbo, the circus elephant.
- U.S. Geological Survey Geographic Names Information System: Jumbo, Ohio
- The History of Hardin County, Ohio. Warner Beers & Company. 1883. p. 703.
- "Hardin County". Jim Forte Postal History. Retrieved 14 December 2015.
- Overman, William Daniel (1958). Ohio Town Names. Akron, OH: Atlantic Press. p. 67.
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