[oolongCat]

Is there a specific format for an address to work?

For instance on locationiq.org

Department of Food Safety and Zoonoses (FOS) World Health Organization Avenue Appia 20 Geneva

Does not work.

On maps.google

  Department of Food Safety and Zoonoses (FOS) 
  World Health Organization Avenue Appia 20
  Geneva

Doen't work

but

  World Health Organization 
  Avenue Appia 20. CH-1211 Geneva 27

works on google.

[sgnelson]

At least for the US, you can check out USPS CASS. I can't tell you about the rest of the world, but I'd bet bet that the EU has something similar.