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Postal Explorer > Publication 28 - Postal Addressing Standards > 2 Postal Addressing Standards > 22 Last Line of the Address
It is strongly recommended that addresses use only approved Last Line (city)
names as described in the Postal Service City State file currently in effect.
City names with the City State Mailing Name indicator flag set to YES in the
City State file are considered part of a complete and standardized address;
city names with the flag set to NO in the City State file should not be used in
a complete and standardized address. For a complete and standardized
address, abbreviations for city or state names must be shown in the Postal
Service City State file. If you are preparing prebarcoded mail, city names set
to NO for mailing name can be used.
With the exception of the hyphen in the ZIP+4 Code, punctuation may be
omitted in the delivery address block.
Spell city names in their entirety. When abbreviations must be used due to
labelling constraints, use only the approved 13-character abbreviations
provided in the City State file.
Note: Normally, the abbreviations follow the logic of using existing
abbreviations, such as for suffix or directional words.
Format the Last Line with at least one space between the city name,
two-character state abbreviation, and ZIP+4 Code.
Note: Two spaces are preferred between the state abbreviation and
ZIP+4 Code.

Overseas military addresses must contain the APO or FPO designation along
with a two-character "state" abbreviation of AE, AP, or AA and the ZIP Code
or ZIP+4 Code.
AE is used for armed forces in Europe, the Middle East, Africa, and Canada;
AP is for the Pacific; and AA is the Americas excluding Canada.
Use only the approved city name as listed in the City State file, along with the
two-character state abbreviation and the ZIP Code or ZIP+4 Code.
The preprinted Delivery Point barcode must be correct for the delivery
address, city, state, and ZIP+4 Code that appear on the mailpiece.
• See Publication 25, Designing Business Letter Mail, Chapter 5.
• See the DMM for the barcode requirements that must be met to qualify
for automation rates.
• For a list of vendors certified for various barcoding products, please
visit our Web site at www.usps.gov or call 800-238-3150.
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