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Setting a default country/zip code is not possible from the builder, the only way I can think to acccomplish that is by using URL parameters. That way you would need to add this parameters to your form URL ?address[postal]=123456.
So the result would be: https://www.jotform.com/form/41314305163341?address[postal]=123456
Of course you have to change the string of numbers 123456 to the correct Zip code.
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