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ZIP Types: The USPS assigns types to ZIP Codes:
- S - Standard,
- P - PO Box Only,
- U - Unique (Companies, organizations, and institutions...),
- M - Military
City Type: In many cases, a ZIP Code can have multiple "names", meaning cities, towns, or subdivisions, in its boundaries. However, it will ALWAYS have exactly 1 "default" name.
- D - Default - This is the "preferred" name - by the USPS - for a city.
- A - Acceptable - This name can be used for mailing purposes. Often times alternative names are large neighborhoods or sections of the city/town. In some cases a ZIP Code may have several "acceptable" names which is used to group towns under one ZIP Code.
- N - Not Acceptable - A "not acceptable" name is, in many cases, a nickname that residents give that location. According to the USPS, you should NOT send mail to that ZIP Code using the "not acceptable" name when mailing.