All addresses are pretty hard for computers to understand, so the people building the software to make them understand (geocoders) usually make them work for th

All addresses are pretty hard for computers to understand, so the people building the software to make them understand (geocoders) usually make them work for the most 'in-demand' address formats. Just like every other bit of software, finding the special cases and figuring out how to understand them is tricky. http://www.columbia.edu/~fdc/postal/ http://www.columbia.edu/~fdc/postal/ is a pretty good overview of most of the postal addressing systems around the world.