This is a 9-digit format (e.g., 15730-XXXX) used by the USPS for more precise mail delivery.
Some countries use longer numerical strings for their postal systems. 157309 zip
The query for is a bit unusual because standard U.S. ZIP codes are typically only five digits long. This is a 9-digit format (e
Once you let me know which one you're after, I can dive into the details and write that blog post for you! ZIP Code™ Lookup | USPS This is a 9-digit format (e.g.