User blog comment:NathanGMan/Phineas and Ferb Live In VIRGINIA?/@comment-4912228-20120406212544

Actually, Danville doesn't exist geographically. There is NO state that exists that is near the ocean and yet a days distance from Mt. Rushmoore.

Plus, 2308 isn't a zip code, it's the house number. On another note of that, a zip code has 5 numbers, while a house number normally has 5 numbers too. So that's another impossible thing.

Dan says that Danville is whereever it needs to be for the episode.