300 E John Carpenter Fwy Irving Tx 75062
The +4 Code is part of the range that corresponds to the high-end of a zip code. The Base Alternate Code specifies the type of base record. The base record represents a range of addresses, whereas the alternate record represents a single delivery point. In this case, government deliveries will be listed only on the alternate records if they are made to a building that has a government building indicator.
