There are three addresses associated with a shipping label.
1. The From Address uses the address of the warehouse where an order is shipped out from and can be selected in the ship screen when fulfilling orders.
2. Return - The address that orders should be returned to. This can be changed in your store's settings.
3. Destination - The customer's address shown on the order.
Note: Depending on your carrier, some labels "ship from zip code" may come from this address. Additionally, not all carriers listen to what we send them for these, and your carrier may OVERRIDE these addresses. Many "endicia" or "stamps.com" users find the origin address is locked on their accounts, and must reach out to those carriers to update their origin address across the board.