So, if the user adds to the location either the country name (in English or another language you scan for) or if they add their city and you have them in your association list, you count them in the respective country?
For example, if the location is United States, USA, or Los Angeles, do they all produce United States results?
I do a custom search for each country. I can't automatically determine if a given location is in a country, so I include specific major cities to try and capture most users who may include a location but not the country name.