Iowa State Route 25 is a north-south highway in Central Adair County. This runs from the Union/Adiar County Line, near Orient, to the Adair/Guthrie County Line, near Casey. IA St Rt 25 passes through the following towns in Adair County Orient Greenfield IA St Rt 25 is not multi-plexed in Adair County. IA St Rt 25 intersects the following highways in Adair County. Iowa State Route 92, at Greenfield. Interstate 80, near Casey. U.S. Rt. 6, near Casey.
