Illinois Route 121

Illinois Route 121 (IL 121) is a 109.48-mile-long (176.19 km) major state highway in the central part of the U.S. state of Illinois. Although it travels from northwest to southeast, it is marked as a north–south highway.[3] It travels from IL 130 in Greenup (very near U.S. Route 40) to Interstate 55 (I-55) in Lincoln at the interchange of I-55 and IL 10.

Illinois Route 121
Route information
Maintained by IDOT
Length109.48 mi[1] (176.19 km)
Major junctions
Southeast end IL 130 in Greenup
Northwest end I-55 / IL 10 in Lincoln
CountiesCumberland, Coles, Moultrie, Macon, Logan
Highway system
IL 120IL 122

Route description

IL 121 travels north from Greenup near I-70. While traveling northwest, IL 121 travels through Toledo and has an interchange with I-57 in Mattoon.

From there, it travels northwest into the city limits of Decatur but largely goes around downtown using 22nd Street and Pershing Road. On the northwest side of Decatur, IL 121 intersects with the concurrent I-72 and US 51.

IL 121 continues further northwest into Lincoln, where it has a concurrency with IL 10 through Lincoln as Keokuk Street and Woodlawn Road before terminating at I-55 just south of I-155. IL 10 continues west on the same road.


State Bond Issue (SBI) Route 121 formerly traveled from Peoria to the Indiana state line east of Chrisman. When US 36 was established in the late 1920s, IL 121 was dropped east of Decatur. In March 1937, IL 121 replaced then IL 131 and IL 132 south of Decatur to Greenup.[4]

In 1993, I-155 north of Lincoln was completed. IL 121 was then dropped from this stretch of freeway.

IL 121 had a business route through Decatur until about 1980 along Main Street and Water Street. This was replaced by US 51 Business.[2]

Major intersections

CumberlandGreenup0.00.0 IL 130
19.030.6 US 45 southSouth end of US 45 concurrency
ColesMattoon23.638.0 I-57 Effingham, ChampaignI-57 exit 184
27.444.1 IL 16 east CharlestonSouth end of IL 16 concurrency
27.444.1 IL 16 west ShelbyvilleNorth end of IL 16 concurrency
28.045.1 US 45 north ArcolaNorth end of US 45 concurrency
MoultrieSullivan44.471.5 IL 32 south EffinghamSouth end of IL 32 concurrency
45.873.7 IL 32 north LovingtonNorth end of IL 32 concurrency
Dalton City58.894.6 IL 128 south Shelbyville
MaconDecatur67.3108.3 US 36 east TuscolaSouth end of US 36 concurrency
70.4113.3 US 36 west / IL 105 west SpringfieldNorth end of US 36 concurrency; south end of IL 105 concurrency
70.6113.6 IL 105 east MonticelloNorth end of IL 105 concurrency
72.7117.0 IL 48 north ArgentaSouth end of IL 48 concurrency
US 51 Bus. north (Water Street) Bloomington, Clinton
One-way pair
US 51 Bus. south (Main Street) Macon, Pana
One-way pair
75.3121.2 IL 48 south TaylorvilleNorth end of IL 48 concurrency
77.5124.7 I-72 / US 51 Springfield, Pana, Champaign, BloomingtonI-72 exit 138
LoganMt. Pulaski94.3151.8 To IL 54 Clinton, Springfield
Lincoln105.5169.8 IL 10 east ClintonSouth end of IL 10 concurrency
105.9170.4 I-55 Bus. north (Kickapoo Street) / Historic US 66 east1930-1940 Historic US 66
106.1170.8 I-55 Bus. south (Logan Street) / Historic US 66 west1930-1940 Historic US 66
107.6173.2 Historic US 66 (Lincoln Parkway)
109.48176.19 I-55 to I-155 north Bloomington, Springfield, Peoria
IL 10 west Mason City
Northern terminus; north end of IL 10 concurrency; I-55 exit 126
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

  • U.S. Roads portal
  • Illinois portal


  1. Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
  2. Carlson, Rich. Illinois Highways Page: Routes 121 thru 140. Last updated March 15, 2005. Retrieved May 9, 2006.
  3. Sarjeant, Charles. Illinois 121. Retrieved May 9, 2006.
  4. "State Highway Markings to be Changed". The Journal Gazette. March 29, 1937. p. 1. Retrieved December 12, 2016 via
  5. Google (March 2, 2017). "Overview Map of IL 121" (Map). Google Maps. Google. Retrieved March 2, 2017.
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