This plugin allows a WordPress Site Admin to enter locations of stores etc into the db. The information is then displayed on the front end 
using the google maps interface. The user can enter a starting location in the search field, the system will then find the closest location from 
it’s starting point and display the path and steps necessary to get to that location. If many locations are available in a similar range range, 
the plugin will request the driving distance between the two closest locations. It help to avoid the pitfall of getting an office across a river 
which may take a lot of driving to get to.
This plugin requires a valid Google Maps API key (free) from Google. If you do not have an API key you may get one here. 
http://code.google.com/apis/maps/signup.html
The actual google maps functionality is based on GoogleMapAPI – A library used for creating google maps. Which can be found here 
http://www.phpinsider.com/php/code/GoogleMapAPI/

GoogleMapper

This plugin allows a Wordpress Site Admin to enter locations of stores etc into the db.  The user can then search for the closest location.

Alex

This plugin lets you create state regions on top of a Google Map then add a popup box with external links. Currently supports only USA map
<h4>Features</h4>
<ul>
<li>Have unique color for a region </li>
<li>Ability to add external links to a state</li>
</ul>
<h4>Usage</h4>
Use [fusion_retailers_map] or place <code><?php echo do_shortcode('[fusion_retailers_map]'); ?></code> in your templates to output the necessary HTML markup for the map.
Got questions or comments? 
Visit us at <a href="http://graphicfusiondesign.com" rel="nofollow ugc">Graphic Fusion Design</a>

Google Maps Retailers

Plugin to manage and output retailers by region on a Google Map.

GoogleMapper vs Google Maps Retailers