Illinois 142 is a NW-SE running route that goes from Mount Vernon, through McLeansboro, to end in Equality, in Gallatin County.

Intersections from northwest to southeast:

IL142 starts in the north at IL37, at what is also IL148's northern endpoint

IL242 at its southern end in McLeansboro

IL14 at McLeansboro

US45 at Eldorado

IL13 by Equality

Finally, IL142 terminates in Equality.

It passes through these towns: Mt. Vernon, Belle Rive, Dahlgren, Delafield, McLeansboro, Broughton, Eldorado, Equality.

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