Illinois 43 is a north-south route running through the City of Chicago and points north, terminating in the Waukegan area. Its southern end is near Frankfort.

Intersections from north to south:

US41 at its intersection with IL120

IL137

IL176 near Lake Bluff

IL60 near Lake Forest

IL22

I-94 to the north (west)*

IL68 at Northbrook

IL58 joins from the west at Glenview

IL58 leaves toward the east as US14 joins from the west at Morton Grove

US14 leaves eastward

IL21 at Niles

I-90 close to Chicago

IL72 just after the interchange with I-90

IL19 in Chicago

IL64 in Chicago

I-290 in Chicago

US34 at that route's eastern end*

I-55 near Summit

US12/US20 near Burbank and I-294

IL7 at Worth

IL83 at Palos Heights

US6 at Tinley Park

I-80 near Tinley Park

IL43 ends at US30.

It passes through these towns: Park City, Deerfield, Northbrook, Glenview, Morton Grove, Niles, Harwood Heights, Chicago, Elmwood Park, River Forest, Summit, Forest Park, Berwyn, Stickney, Lyons, Bedford Park, Bridgeview,

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