Millwood was laid out around 1825. A post office called Millwood was established in 1833, and remained in operation until 1907. Some say the community was named for the mill and woods near the original town site, while others believe the name honors one Mr. Millwood, a personal friend of the proprietor.
- U.S. Geological Survey Geographic Names Information System: Millwood, Ohio
- Graham, Albert Adams (1881). History of Knox County, Ohio: Its Past and Present, Containing a Condensed, Comprehensive History of Ohio. A. A. Graham & Company. p. 554.
- "Knox County". Jim Forte Postal History. Retrieved 29 December 2015.
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