I had a similar question, here is the response I received:
https://ttlc.intuit.com/replies/7269572?notification_token=6e89197a7d062c74705df11e514ca8f7
Basically, leave your current (non-NJ resident) address in the form, but fill in the county code from when you were an NJ resident. For example, if you moved from Morristown, NJ to CA, your CA address is the one that gets filled in, but for the county code put in Morristown's.
Link for NJ municipal/county codes is here: https://www.state.nj.us/treasury/taxation/pdf/lpt/cntycode.pdf
I hope this helps you too!