Kentucky Route 70 (KY 70) is a long east-east state highway that originates at a junction with U.S. Route 60 (US 60) in Smithland in Livingston County, just east of the Ohio River. The route continues through the counties of Crittenden, Caldwell, Hopkins, Muhlenberg, Butler, Edmonson, Barren, Barren, Metcalfe, Green, Taylor, Casey, Pulaski, Lincoln and back into Pulaski again to terminate at a junction with US 150 near Maretburg in Rockcastle.

Crittenden County is a county in the U.S. state of Kentucky. At the 2020 census, the population was 8,990. Its county seat and only municipality is Marion. The county was formed in 1842 and named for John J. Crittenden, senator and future Governor of Kentucky.