There is a bit of confusion that is being perpertuated on this topic. I faced a similar problem with my application. I had lived in new jersey for years when i applied for citizenship. You are only expected to meet the 90 day requirement when you put in the application the first time. If you move, i will submit that there maybe delays because everybody's situation is different...but in my case there no delays whatsoever. Like I said, i applied while i lived in new jersey, did my FP in new jersey but moved to new york a few days before my interview. I called USCIS and told them i had moved and they simply cancelled my interview in jersey and gave me one in new york a couple of weeks later.