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This question is kind of old, but I have been researching because I had the same problem. Turns out GA doens't track visitors with javascript and cookies disabled. This could also account for a part of the non registered visits by GA. I suggest you check the server logs. You'll probably find the data match there More resources here: http://cse-sea.blogspot.com/2009/09/troubleshooting-discrepancies-between.html http://productforums.google.com/forum/#!topic/analytics/cotsK2GNh_w Hope this helps someone else with the same problem.