Intersections from west to east:

US20 enters the state of Illinois from Dubuque, Iowa, at the northwest corner of the state

IL35 at East Dubuque

IL84 joins US20 from the north through Galena

IL84 breaks off to head south again

IL78 joins from the south at Stockton

IL78 leaves to head north again, just outside of Stockton

IL73, near Lena

Business US20 (Freeport) begins-- US20 forms a northern bypass of Freeport

US20 crosses IL26 north of Freeport

IL75 north of Freeport

Business US20 comes back to US20

Another Business US20 begins heading toward Rockford, as US20 forms a southern bypass of that city

IL2 by Rockford

IL251 by Rockford

I-39/US51 joins US20 east from the south, by Rockford

US20 breaks off of I-39/US51 to head east and parallel I-90

It passes through these towns: East Dubuque, Galena, Stockton, and Rockford. It bypasses Lena, Freeport, Pecatonica, Winnebago, and downtown Rockford.

Continue east- Boone/McHenry County line to DuPage/Cook County line

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