United States. When used in the geographical sense, includes the several States, the Commonwealth of Puerto Rico, the insular possessions of the United States, the District of Columbia, and any territory over which the United States exercises any powers of administration, legislation, and jurisdiction.
27 CFR § 447.11
When used in this part and in forms prescribed under this part, where not otherwise distinctly expressed or manifestly incompatible with the intent thereof, terms shall have the meanings ascribed in this section. Words in the plural form shall include the singular, and vice versa, and words imparting the masculine gender shall include the feminine. The terms includes and including do not exclude other things not enumerated which are in the same general class or are otherwise within the scope thereof.