Illinois Route 143

Illinois Route 143 is an eastwest state highway in southwestern Illinois. Its western terminus is at U.S. Route 67 (very near, but not at the termini of Illinois Route 100 and Illinois Route 140) in Alton. Its eastern terminus at Illinois Route 127 at a rural intersection west of Tamalco. This is a distance of 47.96 miles (77.18 km).[1]

Illinois Route 143
Route information
Maintained by IDOT
Length47.96 mi[1] (77.18 km)
Major junctions
West end US 67 in Alton
  I-55 in Edwardsville
I-70 in Marine
US 40 in Highland
East end IL 127 in Tamalco
CountiesMadison, Bond
Highway system
IL 142IL 145

Route description

Illinois 143 overlaps Illinois Route 157 and Illinois Route 159 in Edwardsville, and Illinois Route 160 and U.S. Route 40 in Highland. It has 4 lanes from IL 140 to just east of Illinois Route 255 around Southern Illinois University, Edwardsville, and briefly around Interstate 55 east of Edwardsville. The rest of the road is generally rural and has 2 lanes.


SBI Route 143 ran from Benton to Harrisburg; this was replaced by Illinois Route 34 when it was extended north in 1937. That same year, IL 143 was applied to a former lettered route, Illinois Route 127A from Highland to Illinois 127.[3] In 1950, it was extended west to Edwardsville. In 1964, it was extended west again to Alton, replacing Illinois Route 159. There have been no changes since.[2]

In 1987, the alignments of Illinois Route 3, Illinois Route 100, and Illinois Route 143 were switched to their current routes in the Alton area with the opening of the extension of the Homer M. Adams Parkway and the construction of Madison Avenue in Wood River. IL 143 was put on the new Madison Avenue alignment and routed on the Berm Highway, while IL 3 was put back on an older alignment through East Alton and the Homer Adams Parkway (later taking over the old IL 100 alignment north of Godfrey to Grafton), and IL 100 was put on then-unmarked River Road from Alton to Grafton. The old alignment of IL 143 (Alton-Edwardsville Road) became unmarked.

Major Intersections

MadisonAlton0.00.0 US 67 / Great River Road north Godfrey, St. LouisWestern terminus of IL 143; west end of Great River Road concurrency
0.10.16 IL 140 east (Broadway Connector) BethaltoWestern terminus of IL 140
Wood River4.26.8 IL 3 (Lewis and Clark Blvd) / Great River Road south Granite City, East AltonEast end of Great River Road concurrency
5.89.3 IL 111 (Central Ave)
Roxana7.512.1 IL 255 Alton, To I-270IL 255 exit 6
Edwardsville12.219.6 IL 159 north Bunker HillWest end of IL 159 concurrency
13.521.7 IL 157 south (Vandalia St) / IL 159 south (Main St)East end of IL 159 concurrency; west end of IL 157 concurrency
14.022.5 IL 157 northEast end of IL 157 concurrency
17.327.8 I-55 Springfield, East St. LouisI-55 exit 23
22.536.2 IL 4 Staunton, Lebanon
25.841.5 I-70 Effingham, East St. LouisI-70 exit 24
Highland30.048.3 US 40 west East St. LouisWest end of US 40 concurrency
30.549.1 IL 160 northWest end of IL& 160 concurrency
31.150.1 IL 160 south (Sycamore St) TrentonEast end of IL 160 concurrency
33.654.1 US 40 east Vandalia, St. LouisEast end of US 40 concurrency
Bond47.9677.18 IL 127 Greenville, CarlyleEastern terminus of IL 143
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
  2. Carlson, Rich. Illinois Highways Page: Routes 141 thru 160. Last updated April 15, 2005. Retrieved June 23, 2006.
  3. "State Highway Markings to be Changed". The Journal Gazette. March 29, 1937. p. 1. Retrieved December 12, 2016 via
  4. Google (March 5, 2017). "Overview Map of IL 143" (Map). Google Maps. Google. Retrieved March 5, 2017.
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