Neat visualization. There is a street performer in my town that has them all memorized (and many international zip codes as well) and makes a fun show of it, asking people what zip code they are from and putting them on a map. Sometimes it takes him a second to recall the exact town name but he always knows instantly what city they are close to, helped no doubt by the locality of the mapping. Example video:
https://www.youtube.com/watch?v=eSFt38IS0QU