@colinthemathmo @art I don't think there's a unified meaning. Partly because the definition of "town" varies so much from state to state.
However, I would consider a "tiny town" to be a place that is outside of a major urban area, a place with a relatively small population. Some other characteristics would depend on how the local economy is structured and the distance to an urbanized area. For example, Idyllwild, California, is close enough to the #SoCal urban area that weekend visits are possible, so I'd expect tourism to be a big part of their economy.
@lnxw48a1 Ah, so this is literally a "tiny town" in the sense of a town that's really small. I was thinking along the lines of the computer/internet "tiny town", which is obviously something different.