Postal Route
GeoCodes - A GeoCode is a 9 character code that includes the zip code and the postal route code. An example of this would be a zip code of "43130" and a postal route code of "B001". The GeoCode for this example would be "43130B001".
The postal route codes can start with B (P.O. Box), C (City Style), R (Rural), H (Highway), or G (General Delivery).