Smallest town

[florida]

I-10, Exit 217 in Florida (SR 59) gives access for Lloyd, FL which has a population of 34 (in 2000). Next biggest contender would be Exit 104 for Caryville, population 232.

[Alex]

So to go back to the original question, are we talking about just passing through the limits of an incorporated town or city, or through the actual "downtown" or central business district or whatever you want to refer to as the hub, of a city?