Find Nearest Location

I have done this before. If you search this Forum on Pythagoras you should get many posts on this mostly by me. 

I can help you on a one on one session if you need help, it usually only takes an hour of consulting time to get this working. 

The messy part in you situation will be how to get the geocode for the given address. 

If you'd like you can contact me directly by the email in my signature line.