If you're buying locally grown, then you know where that apple, or tomato, ear of corn or banana came from. But if you're buying any of those or 91 other produce commodities from a chain supermarket or a local grocer and you're interested to find out where that apple, tomato, ear of corn or banana was originally grown, then you can do so here in this (albeit limited) data base. http://www.leopold.iastate.edu/resources/fruitveg/fruitveg.php
Just pick a commodity from the drop down menu and hit "calculate".