The familiar five-digit number was part of a nationwide effort to modernize the mail.

On July 1, 1963, the U.S. Post Office Department introduced the ZIP code program to get a handle on the heaping surplus of mail. Today, those five digits represent much more for American society. Back ...

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Many communities currently have outdated zip codes that may cause issues, such as slower mail delivery or delayed emergency service response times. Supporters of Boebert's bipartisan bill believe this ...