[Answer] In what decade was the five-digit ZIP code first implemented?

Step 1 : Introduction to the question "In what decade was the five-digit ZIP code first implemented?"

...The first ZIP codes were two-digit codes used in major cities in 1943. Two decades later, in 1963, the Postal Service introduced a five-digit system nationwide. Today, we use ZIP+4, which debuted in 1983 and added four more digits to indicate a location with even more specificity.

Step 2 : Answer to the question "In what decade was the five-digit ZIP code first implemented?"

1960s:

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