Big Clifty is an unincorporated community and census-designated place in Grayson County, Kentucky, United States.Clifty Creek crosses U.S. Highway 62 and the P & L railroad several miles to the southwest of Big Clifty. It is said that travelers named the town due to the limestone cliffs that arose on the sides of Clifty Creek. Accounts of residents from the past report that Big Clifty was a "boom town" that at one time had a post office, bank, feed mill, several dry goods stores and restaurants. The Ben Goodman school was the local "country school" and the town had numerous churches. In yesteryear nearby Clarkson was a tourist destination due to the numerous hotels near Grayson Springs, which were visited by guests who wished to experience the sulphur water's curative properties. Big Clifty benefited from the traffic going to Clarkson. Spurrier Mill was a grist mill on the Nolin River, several miles from Big Clifty which was a benefit to the economy.