There is also another type of postal code, the ZIP + 4 code. According to unitedstateszipcodes.org, the ZIP + 4 was established in 1983 and identifies an even more specific location within a ZIP code.

ZIP (Zone Improvement Plan) codes were developed by the U.S. Postal Service and introduced in July 1963 as a way to make mail delivery easier.

The U.S. Postal Service opposes two House bills that propose to add 76 new ZIP codes across the country, citing a financial burden and harm to mail ...

Neighbors Worry ZIP Code Change Will Make Delivery Issues Worse The change will take place beginning July 1 By Allie Spillyards • Published May 22, 2018 • Updated on May 22, 2018 at 5:45 pm ...

The House passed two bills Monday night that would authorize the U.S. Postal Service to create 76 new ZIP codes for communities nationwide.  These ...

The approximate shape of Whately’s ZIP codes. On Jan. 1, the town will switch all ZIP codes to 01093. It should be noted the U.S. Postal Service does not maintain an official ZIP code map ...