Illinois Route 143
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 47.96 mi (77.18 km) | |||
| Existed: | 1937 – present | |||
| Major junctions | ||||
| West end: |
 US 67 in Alton
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 I-55 in Edwardsville I-70 in Marine US 40 in Highland
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| East end: |
 IL 127 in Tamalco
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| Location | ||||
| Counties: | Madison, Bond | |||
| Highway system | ||||
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Illinois Route 143 is an east–west 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).
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. 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.
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