20 CFR §416.1600

You are eligible for supplemental security income (SSI) benefits if you meet the requirements in subpart B. Among these are requirements that you must be a resident of the United States and either a citizen, a national, or an alien with a lawful right to reside permanently in the United States. In this subpart, we tell you what kinds of evidence show that you are a resident of the United States (see § 416.1603) and—