It’s a perfect map-match: Just navigate to…

http://www.joshuaproject.net/people-selector.php

Choose the criteria needed for your own project. In my case, I wanted to find totally unreached people groups with populations of 100,000 or more. The People Selector responded almost instantly with 1,587 groups, plotted on a world map. This is a great tool and one for which we’ve dreamed since we began this ministry back in 1995. Great stuff.