ZIP Code

• ZIP Code is a system of postal-zone codes and stands for “zone improvement plan”.
• In 1963, it was introduced in the U.S. to improve mail delivery and sorting capabilities.
• The original code consists of five numbers.
  • It corresponds to the postal codes used in most countries in the world.
  • The first three identify the state and portion of the state, and
  • The last two a specific post office or zone.
• In 1983, a nine-digit code was introduced to further speed delivery.
  • It was created by adding a hyphen and four digits.
  • The first two added digits specify a particular “sector,” and
  • The last two an even smaller “segment” (e.g., one side of a city block).

Source Of ZIP Code

• Britannica