problem setting location for imported listings

I’m ready to launch my site and need to import a huge list of users who are on our waiting list. Each user has a location. When importing using a CSV, all other data is importing just fine, however all map data imports – but doesn’t actually assign the Map Location. If I log into the admin area and set the Map Location manually for a user it works.

Is there a way to set the Map Location without having to click through for each user? I have 1500 of these!

Thanks,