A post office called Minimum was established in 1904, and remained in operation until 1955. The name "Minimum" is said to be derived from the first name of Minnie Farr, the wife of an early postmaster.
- U.S. Geological Survey Geographic Names Information System: Minimum, Missouri
- "Post Offices". Jim Forte Postal History. Retrieved 12 October 2016.
- "Iron County Place Names, 1928–1945 (archived)". The State Historical Society of Missouri. Retrieved 12 October 2016.