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These tables lists the 3-digit ZIP code prefixes, a set of numbers which represents a United States Postal Service  wp (USPS wp) Sectional center facility  wp (SCF wp). Each SCF serves local addresses whose 5-digit ZIP Codes start with the same 1st 3 digit prefix.

* - The city name listed is the "default" city name for all postal codes in this prefix.
- The SCF serving this prefix/postal code is in a different State or Territory.
- This prefix/postal code is in a different State/Territory, but is still handled by this SCF.
§ - This prefix/postal code was reserved for States/Territories that needed additional codes outside of the normal range that was assigned to that State/Territory.
~ - This prefix/postal code is not assigned to a State/Territory at the moment, but is reserved for the States/Territories, that may need them, listed in between the parentheses.
  1. The prefix 055 is used for IRS Service Center (Andover) unique mail in Andover, Essex County, Massachusetts in addition to the standard 018 prefix.

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