This is an add-on for Super Store Finder for WordPress which is a plugin that allows too many markers to be combined and shown in as clusters.
Super Store Finder for WordPress is a fully-featured WordPress Plugin integrated with the latest Google Maps API that allows customers to locate your stores easily. Tailor-made with intuitive responsive design for smartphones, tablets and touch screen devices. It has powerful store locator admin that allows you to manage stores, tags/categories and customize styles, colors, labels, notifications, regions and map settings.