Cupcake, XOPL is correct. When you consider the population of just one CITY in Ohio - Cleveland, OH is 478,403 (in 2000) and the population of the ENTIRE state of N. Dakota is about 642,200 (in 2000). You can see there is a real difference in population density between west/mid-west vs. the eastern US. Also, if you look at the map close to CA and western shorelines, you can see the Wal-Mart density increases again.

Something along the same lines that was kind of funny. A few years ago, I went out to Iowa with a friend to assist some of his family with their farming. They wanted to take us to a new restaurant that just opened up and was the first in the state. Everyone in Iowa was just buzzing about this new restaurant. The name of it was "Bob Evans". We just laughed and told them that restaurant has been around for about 20-30 years in Ohio.