You may be able to apply for Google’s Webmaster tools. They have awesome analytics for all kinds of great stuff – http://www.google.com/webmasters/ As for going through WordPress to actually identify which visitors are located where, that I don’t thingkyou can do. I would definitely give Google’s Webmaster tools a try!
Do note though that IP addresses can only tell you a general vicinity. Mine for example will either show me in Salt Lake City, Cheyenne, WY or Denver, CO – the closest of which is 350 miles from where I am.