When considering the many descriptors of your market territory, many retail businesses owners will consider the closest population from their store location.  This tool is available with most mailing list providers today and if used properly, can be an effective way to identify potential prospects.
A radius is the circumference population defined by distance from the centroid (center).  From your store, you may want to reach out 10 miles in every direction.  The 10 mile band is called the radii band which identifies the furthest most prospects you may want to consider mailing.  With some mapping programs, the radius function grabs all data contained within the radii band, while others cross through a whole carrier route.  In crossing through this carrier route, the ...