I was living in a different state when I filed last year (March 2016, filing for 2015) and do not remember which address I used. I moved again and now (2017, filing for 2016) I cannot see the details of my 2015 return w/o first paying for TurboTax Deluxe, which I'm going to get in the course of filing my 2016 return, but don't have yet.
I do not know if I need to change my address with the IRS on my 2016 return or if they already have this information from USPS mail forwarding, Voter Registration, etc.
