3 Digit Interstates Longer Than 2 Digit Interstates In The Same State

[MultiMillionMiler]

I-78 in NY includes the roundabout after exiting the tunnel.

[Flint1979]

You won't find any in Michigan. The longest 3di is I-196 and the shortest 2di is I-96. I-96 is 112 miles longer than I-196.

[1995hoo]

I-535 in Wisconsin at less than 1 mile vs 0 for I-35.
I-275 in Indiana at 3.2 miles vs 0 for I-75.

The 2di has to exist in the state LOL

That was not one of the OP's criteria.

Notice he added that later. I at least had a plausible reason for citing an instance where the 2di doesn't enter the state, as at the time he had not clarified.