1. A geographic data visualization system, comprising: a mapping system for displaying a map having a plurality of geographic regions, wherein each geographic region is selectable; a demographic system for displaying demographic statistics for a selected geographic region; a matching system for calculating and displaying a set of similar geographic regions that have demographic statistics that most closely match the selected geographic region; and an adjustment system that allows a user to adjust a target value for the demographic statistics being display, wherein an adjustment to the target value causes the matching system to recalculate the set of similar geographic regions.