Collect and store customer information

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Hi everyone, I'm starting a regional business and would like to ask visitors for their zip code when they sign up for newsletter/marketing email so I can provide information relevant to their location.   


I added contact[ZIP] to the newsletter section just above the email.  it's showing up fine on the front end  and customer can enter and submit.  however, as far as I can tell, no zip data appears on the backend whereas email is properly stored.  I guess the bigger question is how custom data is collected and stored in shopify.  I understand that it's possible to create custom field as part of the registration but I'd like a light weight newsletter signup process (without full registration) that also collects one or two other useful pieces of information if possible.


Thanks in advance for any insight!