是指在递交入美籍申请之日前3个月必须在某一州内连续住满3个月么？
-Correct. You have to be the resident of the state (not tempoary living such as travel to live there) at least 3 months before you file N-400.
还是指在拿到绿卡后到递交入籍申请前，在连续住满3个月的任何一个州内都可以申请？
我最近2年改行，工作不太稳定，常常要跨州搬家，很担心这3个月的规定延误入籍申请。
请问移民局一般要求证据来证明你在该州住满3个月了么？
要求的话，一般是什么证据？
--Such as your driver license or registration of your resident address in the local DMV, employment verification letter, tax return for that state, house owner, lease, etc.
另外，入籍申请递交上去后，如果跨区搬家，是否会导致入籍审批过程被拖慢？
-Normally no, but you need to inform USCIS about your address change as soon as possible in case yopu miss any correspondence from USCIS about your case.
我现在NJ，入籍的人多。听说纽约所在的地区中心从申请到面试要等10-11个月。
有哪些中心速度快些，比如5-6月就可以么？
