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In addition, applicants are required to show they have resided for at least three months immediately preceding the filing of Form N-400 in the USCIS district or state where the applicant claims to have residency.

这段所说的3个月，是必须physically 的住3个月吗？我们已经在目前住址居住了5年多，而且会以现在住址申请入籍。

但由于今年1 月回国工作了，如果8月回美，可以直接申请入籍吗？-Yes. You had better not stay in China for > 6 months continuously, if possible.

还是必须回来住满3个月以后才能申请？-Not need.