Illinois State Route 26 runs north-south along the eastern side of the Illinois River in Putnam County. IL St Rt 26 does not pass through any towns in Putnam County. IL St Rt 26 is multi-plexed in Putnam County. Interstate 180, near Hennepin.
A BGS on SB I-180/IL St Rt 26. A BGS on SB I-180/IL St Rt 26. A BGS on NB IL St Rt 26. A BGS on WB IL St Rt 71. A junction marker on WB IL St Rt 71. A junction marker on WB IL St Rt 71. (January, 2009) A junction marker on WB IL St Rt 71. (August, 2023) NB IL St Rt 26 near Hennepin. A junction marker on EB IL St Rt 18/NB IL St Rt 26. EB IL St Rt 18/NB IL St Rt 26 at the Putnam/Marshall County Line.
