Interstate 39

Number of Miles 349

• Illinois - 139 miles
• Wisconsin - 210 miles

Major Cities Along the Route

• Normal, Illinois
• Madison, Wisconsin

Intersections with other Interstates

• Interstate 55 in Normal, Illinois
• Interstate 80 in La Salle, Illinois
• The western Interstate 88 in Rochelle, Illinois
• Interstate 90 in Rockford, Illinois. They stay joined until Portage, Wisconsin
• Interstate 43 in Beloit, Wisconsin
• Interstate 94 in Madison, Wisconsin. They stay joined for 30 miles.

Spur Routes None

Notes Future plans call for Interstate 39 to be extended north from Wausau to Merrill, Wisconsin[?] along the United States Highway 51[?] freeway, which is Interstate standard, but it is not signed as Interstate as of December 2001.