What do the 4 extra digits in a 9-digit postal code identify?

What do the 4 extra digits in a 9-digit postal code identify?

• A. The county in which the address resides
• B. A specific geographic segment within the 5-digit postal code
• C. The delivery route assigned to the stop
• D. The customer’s unique internal ID

Answer: (B)

The idea being tested is how the ZIP+4 code adds precision to mail routing. Those four extra digits identify a specific geographic segment within the five-digit ZIP code, such as a particular block, street segment, building, or group of apartments. This tighter location helps the postal service sort and deliver mail more accurately and efficiently within that broader area. The other options don’t fit because the five-digit base handles the general area, not the precise spot; delivery routes are organizational, not encoded by these digits; and an internal customer ID is not part of the postal code.

The idea being tested is how the ZIP+4 code adds precision to mail routing. Those four extra digits identify a specific geographic segment within the five-digit ZIP code, such as a particular block, street segment, building, or group of apartments. This tighter location helps the postal service sort and deliver mail more accurately and efficiently within that broader area.

The other options don’t fit because the five-digit base handles the general area, not the precise spot; delivery routes are organizational, not encoded by these digits; and an internal customer ID is not part of the postal code.