Illinois Route 123
IL 123 highlighted in red | ||||
| Route information | ||||
| Maintained by IDOT | ||||
| Length | 33.72 mi (54.27 km) | |||
| Existed | 1924–present | |||
| Major junctions | ||||
| West end | IL 125 in Pleasant Plains | |||
| I-55 in Williamsville | ||||
| East end | Historic US 66 in Williamsville | |||
| Location | ||||
| Country | United States | |||
| State | Illinois | |||
| Counties | Sangamon, Menard | |||
| Highway system | ||||
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Illinois Route 123 (IL-123) is an east–west state highway in central Illinois, USA. 33.72 miles (54.27 km) long, it stretches from Historic Route 66 at Williamsville to Illinois Route 125 near Pleasant Plains.