I've been working all day on a new concept: a way to overlay Counties, Zipcodes and Cities within a State all together on a map such that the result is attractive and meaningful. I first process the Counties giving them random hues of Red, then the Zipcodes with random hues of Green and finally the Cities with random hues of Blue.
The result is fascinating. Here's California and you can feel the unincorporated open County space in Red, the areas in the state where Zipcodes are relevant in Green and the dense population of the Cities in Blue.
It's coming together as an app where you can zoom in and everything is hoverable and clickable. I will certainly share it when ready. The other States are equally fascinating!