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 in 26 January 1905, until it ceased operating 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.
Coordinates: 37°49′25″N 89°04′38″W / 37.82361°N 89.07722°W