Indiana State Route 46 is an east-west highway in Central Decatur County. It runs from the Bartholomew/Decatur County Line, near Hartsville, to the Decatur/Franklin County Line, near New Point. IN St Rt 46 passes through the following towns in Decatur County. Greensburg Mc Coy New Point IN St Rt 46 is multi-plexed in Decatur County. Indiana State Route 3, from near Ewington to Greensburg. U.S. Rt. 421, at Greensburg.