Plugin that shows visitors location???

There are several options one is ip2location.com that is pretty good. another is a script that is fairly accurate. It depends on what you are plugging the visitors location into to reveal their location. Like google maps would be an option also.

You could check out the MaxMind GeoIP API:

https://www.maxmind.com/app/javascript_city

The JavaScript API is probably going to be the easiest to setup, second to the PHP API:

https://www.ryanjparker.net/geo-targeting-with-maxminds-geoip-api/