Bath and Ledbury (places I've called home) should both get one: Ledbury has Elizabeth Barrett Browning and John Masefield. Bath has Austen and Sheriden, as well as numerous fictional characters.

Bath seemed like maybe half of its economy was based on Austen when I was there. I suppose the kick ass Georgian architecture didn't hurt. But yes! Literary maps for everywhere!

My hometown hasn't much - Thomas Wolfe used it briefly in one of his novels, and that's about it.