Illinois State Route 123 runs in Sangamon County in two parts. The original portion was a short one mile strech from the Menard/Sangamon County Line to Illinois State Route 125. In October, 2003, this was extened back into Sangamon County near Athens. It ran to Williamsville. IL St Rt 123 gives a single number for tourists to follow from Interstate 55 to Lincoln's New Salem Historical Site. Info on IL St Rt 123 in Sangamon County is divided into two sections. Eastern SectionWestern Section
