The following links come from Jeff Watson's Ultimate Interstate System page.
Interstates 10-19
Interstates 20-29
Interstates 30-39
Interstates 40-49
Interstates 50-59
Interstates 60-69
Interstates 70-79
Interstates 80-89
Interstates 90-99
To view the whole list, just click on the following link:
http://www.geocities.com/ultimateinterstatesystem/listofinterstates.html
Two-Digit Interstates
Three-Digit Interstates
Even More Routes
Links to Other Highway Sites