This map is a Statistical Map showing metropolitan and micropolitan statistical areas of the United States as well as Puerto Rico in the 2003 year. The map represents urban, rural, and metropolitan (inside and out) statistics. The page I found it on also gives population qualifications for being represented on the map in metropolitan, urban and rural areas. Statistical maps display the distribution of variables over a given area. In this map, population is represented by the varying degrees of green to grey to represents the value.
Found At: http://www.novoco.com/new_markets/resources/maps_data.php
