X (4).zip Instant

: Using the full nine digits can accelerate mail delivery by up to two days by reducing processing time at mail centers [4, 8].

If "X (4)" refers to a data structure (often found in address verification software), it represents an extension of the basic 5-digit US ZIP Code system [17]. X (4).zip

If you encounter errors when unzipping your "X (4).zip" file: : Using the full nine digits can accelerate