Illinois 143 is an east-west route in southern Illinois, beginning in Alton and ending at IL127 in Bond County.

Intersections from west to east:

US67 in Alton

IL140 in Alton (one block away from its start at US67)

IL3 near Wood River

IL111

IL255 at its current northern end

IL159 joins from the north

IL159 leaves south as IL157 joins IL143 east

I-55

IL4 near Marine

I-70

IL143 joins US40 eastward at Highland

The two routes together cross IL160 at Highland

IL143 leaves US40

IL143 ends at IL127.

It passes through these towns: Alton, Wood River, Edwardsville, Marine, Highland.

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