How does Google Maps determine the location of a postal code?

Hi group,

I'm trying to use the API to calculate distances of certain things
from a certain suburb. We are allowing users to enter a postal code -
which is sent to the API and a latt/long is returned.

What we need to know is how are these postal code 'locations'
determined? is it an average position of all addresses using that
postal code? or is it set specifically?

Cheers,
Dave

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