Indiana State Route 3 is a north-south highway in Decatur County. It runs from the Rush/Decatur County Line, near Williamstown, to the Jennings/Decatur County Line, near Alert. IN St Rt 3 passes through the following towns in Decatur County. Sandusky Greensburg Westport Sardinia IN St Rt 3 is multi-plexed in Decatur County. Indiana State Route 46, from Greensburg to near Ewington. IN St Rt 3 intersects the following highways in Decatur County. Interstate 74, at Greensburg.
A BGS on EB I-74. A BGS on EB I-74. NB IN St Rt 3 at I-74. SB IN St Rt 3 south of I-74. SB IN St Rt 3 near Lincoln. A guide marker on SB IN St Rt 3. SB IN St Rt 3 at Boradway. A junction marker on SB U.S. Rt. 421.
