Global Geocode Library Organizes U.S. Sub-state and Multi-state Region Wikipedia Pages Geographically
The Global Geocodes were designed to support analysis of sub-national political geographies. In the case of the United States, there are sub-state regions – counties or their equivalent, and multi-jurisdictional regions of these political entities, within a state or multi-state and, including municipalities within those units.
For this level, the nation code 5140 with its two digit decimal number, has a two digit field for multi-county regions and a two digit field for counties or county equivalents within that region. Within regions, codes are assigned using the directional path North to South, then East to West (NSEW).
In this example, Delaware, Maryland, the District of Columbia, and Virginia are shown. The District is at the center of several multi-state regions. The components in Maryland and Virginia are, for the most part, also in organized regional groupings.
For the purpose of this work, the County or equivalent is considered the original sub-state region. Delaware, with three counties, has no multi-state regions, but the coding accomplishes putting them in geographic order north to south.
A map follows of the Mid-Atlantic States showing multi-jurisdiction regions. It includes Pennsylvania, New Jersey and West Virginia which have different approaches to multi-county regions.
Some information is in the "Geocode Introduction" sidebar. If you are interested in more information, send me an email for the current paper and related information. Tom.Christoffel (at) gmail.com