Store Locator LE by cybersprocket is a WordPress plugin that puts a search form and an interactive Google map on your site so you can show visitors your store locactions. Users search for stores within a specified radius. Full admin panel data entry and management of stores from a few to a few thousand.
You can use it for a variety of countries, as supported by Google Maps.
Supports international languages and character sets.
Allows you to use unique map icons or your own custom map icons.
Change default map settings via the admin panel including:
Map type (terrain, satellite, street, etc.)
Inset map show/hide
Starting zoom level
You can use miles or kilometers
Download and info: http://wordpress.org/extend/plugins/store-locator-le/