The goal of the United Regions of America map is to group all 3,142 counties (and county-equivalent units) into a small number of regions that are each rooted in physical reality while at the same time being recognizable (or at least plausible) their long-time inhabitants. I’ve striven to define regions and assign counties to them on…

Over the next few weeks, I’ll be posting more about the United Regions of America map, including an overview of each region and major decisions about its component areas; an innovative urban/rural classification of counties, based on a newer way of calculating population density; some basic demographic analysis of each region, drawing on the American Community Survey’s…