Iowa State Route 405 was a short route connecting the Village of Lone Tree to IA St Rt 22 in the southern leg of Johnson County. On July 1st, 2003, the Iowa Department of Transportation transfered jurisdiction to Johnson County. IA St Rt 405 passes through the following town in Johnson County. Lone Tree IA St Rt 405 is not multi-plexed in Johnson County. IA St Rt 405 intersects the following highway in Johnson County. Iowa State Route 22, near Lone Tree.