I played with this plugin a while back and am in the process of installing it for customer. Is there a way to import a populated csv or tab-delimited file so that I won't have to manually enter in a few hundred stores? Looks like support for this plugin is extinct and so is the upgrade site.
http://wordpress.org/extend/plugins/store-locator/
store locator is no longer supporting the upgrade that allows you to import csv files but store locator plus is.
http://www.cybersprocket.com/products/store-locator-plus/
There is a charge for it but only $10 US.
You will also need to allow uploads of csv files to wp
See details here
http://redmine.cybersprocket.com/boards/33/topics/364?r=421