Applicants are required to show that they have:
Resided continuously in the U.S. for five years before applying, (see legal basis), or
Resided continuously in the U.S. for three years in the case of qualified spouses of U.S. citizens, (see legal basis)
“Continuous residence” means that the applicant has maintained residence within the United States for the required period of time shown above.
Extended absences outside of the U.S. may disrupt an applicant’s continuous residence.
Applicants are required to show that they were:
Physically present in the U.S. for thirty months within the five year period before applying, or (see legal basis)
Physically present in the U.S. for eighteen months within the three year period before applying in the case of qualified spouses of U.S. citizens (see legal basis)
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 (See 8 CFR §316.2(a)(5) & §319.1(a)(5)).
Section 316 paragraphs (b), (c), and (f) of the Immigration and Nationality Act allows for certain exceptions to the continuous residence requirement for those applicants working abroad for:
If you seek to preserve your continuous residence for naturalization purposes while employed abroad by one of these recognized institutions you must file Form N-470, Application to Preserve Residence for Naturalization Purposes with USCIS.
An organization may obtain USCIS recognition as an American institution of research for the purpose of preserving the continuous residence status of its employees who are, or will be, naturalization applicants assigned abroad for an extended period of time. The requesting organization should follow the instructions found on the Requesting Recognition as an American Institution of Research page.
For more details see: