Curious Minute answer

In what year did the United States introduce the five-digit ZIP Code?

The answer

1963

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Why it's right

The five-digit ZIP Code debuted on July 1, 1963, to help an expanding postal system sort mail more efficiently.

Did you know?

The five-digit ZIP Code system began on July 1, 1963. Later, ZIP+4 added extra digits for more precise sorting.

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