GeoSmart automatically adds city-precise location information for each comment author to comment metadata for each comment and a map showing comment author location distribution. GeoSmart also ships with a multiple instance capable sidebar widget that displays a map showing the locations of the most recent visitors to your blog.

GeoSmart

Automatically adds city-precise location information of comment authors to comment metadata.

Masoud Binaei

This plugin allow WordPress to detect Real visitors IP Address when WordPress is behind of Reverse Proxy, Load Balancer or CDN. 
It will start working as soon as you activate it.
It is also compatible:
<ul>
<li>Cloudflare.com</li>
<li>geniusguard.com</li>
<li>central-hosting.com</li>
<li>incapsula.com</li>
<li>sucuri.net</li>
<li>barracuda.com</li>
<li>f5.com And Other…</li>
</ul>

Real IP Detector

Very good

This plugin allow WordPress to detect Real visitors IP Address.

GeoSmart vs Real IP Detector