ZIP+4 Explained
Understanding ZIP+4 Codes: What are the Extra 4 Digits After the ZIP Code?

Discover how the extra 4 digits after the ZIP Code improve mail delivery accuracy.

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.