Clifford is a former unincorporated community in northwestern Williamson County, Illinois. It is a former early 20th century mining settlement that has all but disappeared since the closing of local mines.
A post office was established on 26 January 1905, until it ceased operations after 1931.
The population in 1958 was listed as 300.
- James N. Adams, comp. 1989. Illinois Place Names. Springfield, Ill.: Illinois State Historical Society. 324.
- Clifford Maps, Facts & Features: illinois.hometownlocator.com, retrieved 22 Feb 2011.
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