Verify before you rely on this guide
Citizenship rules can change and small factual differences matter. Use the official links below before filing or making a legal decision.
01
The basic three-year framework
An applicant generally must be at least 18, have been a permanent resident for three years and have lived in marital union with the same U.S. citizen spouse during that period. The spouse generally must have been a citizen throughout the qualifying period and remain a citizen through naturalization.
Marriage itself does not confer citizenship, erase immigration history or guarantee approval.
02
What living in marital union means
USCIS looks for actual residence together as spouses, not only a valid marriage certificate. Involuntary or temporary separations can require careful factual analysis. Divorce or legal separation before naturalization can end eligibility under this provision even when the applicant remains eligible under the five-year rule.
Applicants should accurately document shared residence and disclose changes after filing.
03
Residence and travel under the three-year route
The applicant generally needs three years of continuous residence and at least 18 months of physical presence in the United States during those three years. The three-month state or USCIS-district residence rule also applies unless an exception governs.
Trips of more than six months may create a residence problem; trips of one year or more generally break continuous residence absent a statutory exception.
04
Early filing and timing pitfalls
Eligible applicants may often file up to 90 calendar days before completing the continuous-residence period, but they must still satisfy the marital-union and spouse-citizenship requirements for the full statutory period when USCIS adjudicates the case.
If the three-year provision stops applying, USCIS may assess whether the applicant qualifies under another provision, but timing can make a pending application premature.
05
Different rules for certain spouses employed abroad
INA 319(b) provides a separate route for some spouses of U.S. citizens regularly stationed abroad in qualifying employment. It can remove the usual continuous-residence and physical-presence periods, but requires specific qualifying employment and an intention to reside in the United States when that employment ends.
Military spouses and survivors may have additional provisions. Use the exact USCIS route for your facts.
Put the rule into practice
Compare the three-year and five-year routes
CitizenReady summarizes these pages and sends applications only to the responsible government agency.
USCIS: Married to a U.S. citizen ↗USCIS Policy Manual: Spouses of U.S. citizens ↗USCIS: Naturalization eligibility tool ↗