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Illinois Route 123
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
	Illinois State Highway System; Interstate; US; State; Tollways; Scenic;

Illinois Route 123 (IL-123) is an east–west state highway in central Illinois, USA. 33.72 miles (54.27 km) long,^[1] it stretches from Historic Route 66 at Williamsville^[3] to Illinois Route 125 near Pleasant Plains.

Route description

All of IL-123's route is contained within Sangamon and Menard counties. Major towns located on or adjacent to IL-123 include Athens, Petersburg, and Williamsville.

New Salem, the home of Abraham Lincoln in the 1830s, has been reconstructed as Lincoln's New Salem State Historic Site near Petersburg on IL-123.

History

SBI Route 123 was what Illinois 123 is now, plus a road from Ashland south to Alexander at Interstate 72/U.S. Route 36. In 1999, Illinois 123 was truncated on its southern end to Illinois 125. In October 2003, Illinois 123 was extended east to Williamsville, replacing some of Illinois Route 124 in the process as well as all of Sangamon County Route 11.^[2]

Major intersections

County	Location	mi^[4]	km	Destinations	Notes
Menard		0.00	0.00	IL 125 – Beardstown, Springfield	Western terminus of IL 123
		9.4	15.1	IL 97 south	Southern end of IL 97 concurrency
	Petersburg	14.4	23.2	IL 97 north	Northern end of IL 97 concurrency
		21.3	34.3	IL 29 north – Peoria	Northern end of IL 29 concurrency
Sangamon	Fancy Creek Township	27.0	43.5	IL 29 south – Springfield	Southern end of IL 29 concurrency
	Fancy Creek Township	30.6	49.2	IL 124 east – Sherman	Western terminus of IL 124
	Williamsville	33.72	54.27	I-55 / Historic US 66 west – Springfield, Lincoln	West end of Historic US 66 overlap
	Williamsville	34.0	54.7	Historic US 66 east – Lincoln	Eastern terminus of IL 123; east end of Historic US 66 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus