Neither did I, and I’ve lived here over 20 years. Perhaps they are technically considered Interstates (including the further technicality that they don’t leave the state), but nobody here calls them that.
Suffice to say, when you visit Alaska, don’t ask, “Which way to the Interstate?” because no one will know what you’re talking about. For that matter, don’t even use route numbers (A-1, A-3, etc.) because we only use proper names, which don’t exactly correspond to the numbering system.
Here’s one for the true road geeks out there. The Buffalo, New York and Tulsa, Oklahoma metropolitan areas are the only metros in the United States that share a certain trait with regards to limited access highways. What is it?
Hmm. Might it be that the only limited access highways (or at least the only ones that lead out of town) are all tollways?
Give kunilou an EZ-PASS for that fine answer. 
According to my road atlas Topeka Ks,has a 50 mi.tollway,abt half the distance of the Turner Turnpike (Tulsa to Okla.city)Also part of Philly access is the Turnpike (rte.1 to Valley Forge)
I’m thinking the Fla.turnpike is part 1-95 out of Dade-Broward (not too sure about this one)
Just bumping this to note that if “Interstate” means expressway with no traffic lights on it, the Nanaimo Parkway doesn’t count. There are at least five intersections with lights (Fifth St, Jingle Pot Rd, Northfield, Mostar and Aulds IIRC). And the speed limit is 90k. So I don’t think it falls under anything except the most loose definition of “freeway.”