State
State - Includes the fifty States, Puerto Rico, and the Virgin Islands. It does not include the District of Columbia, Guam, the Commonwealth of the Northern Mariana Islands, or American Samoa. State also refers to an interstate instrumentality where applicable.
Source
20 CFR § 404.1202
Scoping language
Terms which have special meaning in this subpart are described in this section. Where necessary, further explanation is included in the section where the term is used.