I am setting up some drivetime zones, surrounding a set of 3 pushpin locations, and securing the zip codes from within those drivetime zones.
They do have some overlap, such that a given zip code may be in each drivetime zone export set.

I need to decide which location that zip code belongs to, based upon either shorter drivetime OR shorter mileage (either is OK).

It doesn't seem that there is specific data tied to the zip codes. Any thoughts on how to construct such a task?

Thanks in advance,