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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Setting your address fields to required should require everything in the field to be filled out:
Though the hint stating the field is required is below the Zip Code field, the whole section is indeed required:
If you are having any issues with this, let us know and we will be happy to have another look. As far as I can tell though, requiring the address field does require everything in the field to be filled.