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Postal Service through the years

Published On: Feb 06 2013 10:05:34 AM CST   Updated On: May 01 2013 11:35:15 AM CDT

Check out landmark moments in U.S. Postal Service history.

Postal Dates - Zip Codes
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1963: Non-mandatory ZIP codes are announced for the entire country, and two-letter state abbreviations are introduced.

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