Illinois Route 121
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 109.48 mi (176.19 km) | |||
| Existed: | 1924 – present | |||
| Major junctions | ||||
| Southeast end: |
 IL 130 in Greenup
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| Northwest end: |
  IL 10 / I-55 in Lincoln
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| Location | ||||
| Counties: | Cumberland, Coles, Moultrie, Macon, Logan | |||
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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. 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.
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.
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