Kentucky State Route 551 runs north-south across Northeastern Adiar County. It runs from the Adair/Casey County Line to near Columbia. KY St Rt 551 passes through the following towns in Adair County. Knifley AbsherKY St Rt 551 is not multi-plexed in Adair County. KY St Rt 551 intersects the following highways in Adair County. Kentucky Secondary State Route 1742, near Casey Creek. Kentucky State Route 76, at Knifkey. Kentucky Secondary State Route 1323, near Knifley.