The zip code ranges served by a carrier are determined by the shipping spreadsheet, which is usually provided to the store by the carrier itself.
But sometimes you may need to block some zip code or zip codes rage. That is, you may want to prevent that a carrier, for a particular zip code or zip codes range, from making deliveries, even if by default it can do so.
To do that, you must exclude the zip codes you don't want to consider from the shipping spreadsheet.
Let's say you want to exclude only the zip code 45920-000 from the spreadsheet of a carrier.
To do so, you would follow these steps:
With this, the spreadsheet would "jump" the zip code 45920-000. And consequently it would no longer be considered as an address served by that carrier.