It has a simple way to count your webs and blogs visitors and category visitors by their countries, by using flag counter you can count your visitor and category them by their countries. There is the code for counter:

<a href="http://s05.flagcounter.com/more/rry"><img src="http://s05.flagcounter.com/count/rry/bg=FFFFFF/txt=000000/border=CCCCCC/columns=3/maxflags=18/viewers=0/labels=0/" alt="free counters" border="0"></a>

For more details, please go to Flag Counter