Russell County is a county located in the U.S. Commonwealth of Kentucky. As of the 2020 census, the population was 17,991. Its county seat is Jamestown and its largest city is Russell Springs. The county was formed on December 14, 1825, from portions of Adair, Cumberland and Wayne Counties and is named for William Russell.

Russell Springs is a home rule-class city in Russell County, Kentucky, in the United States. The city is the gateway to Lake Cumberland, one of the largest man-made lakes in the region, created by Wolf Creek Dam. It is the largest city in the county, having a population of 2,441 during the year 2010 U.S. Census.