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In the US 2 digit postal codes started in 1943 because many of the regulay postal clerks were away fighting WWII and the government the codes would help the inexperienced new clerks in sorting the mail. 5 digit "Zip" codes went into effect on July 1, 1963. ZIP stood for Zoning Improvement Plan.

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15y ago
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14y ago

in 1200 BC

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11y ago

1963

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3y ago

1960

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Q: When did you have to start using zip codes?
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Related questions

What is the zip code for Wyoming?

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A letter identifying the province or territory.


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