Postal Zones are assigned by USPS based on the distance a mail piece travels from the origin to its destination address. The postal zones can help you easily decipher the cost and time the mail piece will take to arrive at its destination. By default, the zone will be available as a column on the Orders module called Zone. There you can sort by Postal Zone, and apply bulk actions to those orders.
If you don't see the column, you can navigate into the bottom left hand corner of the Orders grid to choose the columns to include or exclude from the grid.
Create an Orderbot
By utilizing Postal Zones to automate repetitive tasks such as setting shipping service or warehouse selection. Navigate to the Settings Module and into the sub-module Orderbots. Create a New Orderbot and add the filter, Postal Zone. There you can create filters comparing the Order to USPS Postal Zones 1-9. Then add an automatic action to apply to Orders that qualify such as "Apply cheapest rate" or "Apply best rate"