2 U.S. Code § 4556
2 U.S. Code § 4556 is about State income tax withholding; definitions. It is under Part B (Administration) of Subchapter II (House of Representatives) of Chapter 45 (Congressional Pay and Benefits) of Title 2 (The Congress) of the Code.
For purposes of section 4555 of this title and this section—
(1) the term “State” means any of the several States, the District of Columbia, the Commonwealth of Puerto Rico, or any other territory or possession of the United States;
(2) the term “Member” means a Member of the House of Representatives, the Delegates from the District of Columbia, Guam, and the Virgin Islands, and the Resident Commissioner from Puerto Rico; and
(3) the term “legislative days” does not include any calendar day on which the House of Representatives is not in session.