Milligan's main significance lies in its being the location of the lowest recorded temperature in Ohio history, -39° Fahrenheit. This temperature was recorded at a United States Weather Bureau station on February 10, 1899, during the Great Blizzard of 1899, when the entire state experienced bitterly cold weather for over a week. It is believed that Milligan is so cold because of its location within the valley of the Moxahala Creek, into which cold air flows from the surrounding hills.  
A post office called Milligan was established in 1893, and remained in operation until 1902. 
- Milligan - Ohio's Icebox
- Historical Marker 364 StRt 93 Milligan Ohio's IceBox.Located in McLuney outside of Crooksville, Ohio
- "Perry County". Jim Forte Postal History. Retrieved 17 December 2015.
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