Also, beware of places like Carmel-by-the-sea, CA, where there are no street addresses! None of the houses in downtown Carmel have mailboxes -- they all have P.

Also, beware of places like Carmel-by-the-sea, CA, where there are no street addresses! None of the houses in downtown Carmel have mailboxes -- they all have P.O. boxes at the post office downtown. If you try and geocode these, you wind up with the post office lat/lng and not the house! Frustrating as hell...