ZIP+4 Codes Explained
Understanding ZIP+4 Codes: What Are the 4 Numbers Next to Zip Codes?

Learn how ZIP+4 codes enhance mail delivery accuracy and speed by pinpointing precise locations within standard zip code areas.

ZIP Code Explained
How ZIP Codes Function in the USA: An In-Depth Explanation

Discover how ZIP Codes work in the USA, including the ZIP+4 format and their role in mail delivery.