In 1963, the US introduced a “Zone Improvement Plan” designed to move mail more efficiently. Used in postal addresses, the five-digit code helped “ZIP” mail along more quickly. Zip codes were optional until 1967, when they became mandatory.
Some members of the public were resistant to change, prompting the US Postal Service to make this film to raise awareness. Sit back and enjoy as the “Swinging Six” tout the advantages of using zip codes!