Hello there
I am available to create your Matrix of USA zip codes as you have mentioned, which shows all possible distances between the Zip codes. I would also like to know the use case. For example, in some applications, you may need to keep all possible combinations, but in some applications, it may just be necessary to keep the details of the zip codes such as coordinates, but with distances generated as and when required.
I look forward to your response.
Moosa