Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Money Videos
postal codes
Introduction References & Edit History Quick Facts & Related Topics
Images & Videos
United States Postal Service letter carrier
A sealed envelope with a red wax stamp is overlaid with lit birthday candles shaped as the numbers 2, 5, and 0, in front of a faded background showing a mailbox and a postal worker in a mail truck.
What are zip codes?

postal codes: References & Edit History

Article Contributors

Primary Contributors

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Media added. Feb 11, 2026
Add new Web site: National Center for Biotechnology Information - PubMed Central - Accuracy of city postal code coordinates as a proxy for location of residence. Oct 10, 2025
Add new Web site: BMC - International Journal of Health Geographics - Accuracy of city postal code coordinates as a proxy for location of residence. May 31, 2025
Media added. May 30, 2024
Add new Web site: The Postal Museum - Postcode. Aug 29, 2023
Link added. Feb 16, 2023
New article added. Nov 28, 2022
View Changes:
Article History
Revised:
By: