Yes, I know this is a much-requested feature. Lots of companies collect the postal code but not other information on forms.
Also wanted to mention that Insycle can help with populating states based on postal codes in HubSpot. Full disclosure, I work for Insycle as a product marketer. You can do this using the “Map US Postal Code to US State” function in Insycle. Then you tell Insycle what field to look for the postal code in, and the correct “State” field to populate.
Then, you could schedule this template to run on a consistent basis (daily, weekly, monthly), or even inject it into HubSpot Workflows so that the state field is populated immediately after your form data is collected.
Hope that helps!
Best,
Ryan