Postal Service through the years

Published On: Feb 06 2013 08:05:34 AM PST   Updated On: May 01 2013 09:35:15 AM PDT

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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