For each service, they have different features. From my experiences with different API, Google's geocoding api covers most countries. I suspect for all countri

For each service, they have different features. From my experiences with different API, Google's geocoding api covers most countries. I suspect for all countries that Google provides street view services, the geocoding service will work pretty well. SimpleGeo is pretty good, its coverage is less than Google. Bing supports a lot of countries. But for a lot of countries, it support to major roads. You can see it here http://msdn.microsoft.com/en-us/library/dd435699.aspx http://msdn.microsoft.com/en-us/library/dd435699.aspx Foursquare has around 23 millions venues and growing. I guess in next 2 years, we can see Foursquare's venues covers most mobile GPS coverage area on Earth and if their human administrators can maintain the quality. Google is pretty good and fuzzy matching address. I tried SimpleGeo 6 months ago and it is kind of strict and pretty intolerant to address misspelling. Foursquare can match venue name to possible entries in the neighborhood in venue/search but I am not sure for address matching. Yahoo! PlaceFinder seems lack of maintenance in data. Even they were the first one to provide geocoding api.