The ELOT sequence indicates the order in which the mail carrier can deliver the items. The sequence corresponds to the physical route that the carrier takes at street level. Mail carriers in the United States use Enhanced Line of Travel (ELOT) data to organize mail items for delivery,

The ELOT Sequence port returns a four-digit number. When you add ELOT sequence numbers to a set of mail items, the mail carrier can sort the mail items in numerical order. The code numbers indicate the order in which the carrier will reach each address on the route.