- Education and Science
Explanation of US Zip Codes, or Why United States Zones Are the Way They Are!
ZIP Code Classifications
Upon seeing this request, I visited the USPS website. The information that I found about ZIP codes was quite interesting. For those of you that don't know, ZIP stands for Zone Improvement Plan and was put into action in 1963 by Postmaster General John A. Gronouski. On July 1, 1963, the Postmaster announced that the Zone Improvement Plan code would begin.
The digits mean specific things and here is what they mean:
The First Five Digits
- First Digit: A broad geographic location.
- Second and Third Digits: Pinpoints a more specific area.
- Fourth and Fifth Digits: Designates Post Offices and/or Postal Zones
In 1983 an expansion was needed and became known as ZIP+4. This meant better and faster deliverability for our mail. The 4-digit add-on identifies the following:
- City Blocks
- Office Buildings
- High Volume Mail Receivers
- ... AND MORE!
The ZIP (Zone Improvement Plan) Code is vital to the USPS (United States Postal Service. If you have any further questions about the ZIP Code, please feel free to visit their website. For your convenience a link under the USPS logo above.