In each State entitled in the Ninety-first Congress or in any subsequent Congress thereafter to more than one Representative under an apportionment made pursuant to the provisions of , there shall be established by law a number of districts equal to the number of Representatives to which such State is so entitled, and Representatives shall be elected only from districts so established, no district to elect more than one Representative (except that a State which is entitled to more than one Representative and which has in all previous elections elected its Representatives at Large may elect its Representatives at Large to the Ninety-first Congress).
Structure US Code
CHAPTER 1— ELECTION OF SENATORS AND REPRESENTATIVES
§ 1. Time for election of Senators
§ 1a. Election to be certified by governor
§ 1b. Countersignature of certificate of election
§ 2b. Number of Representatives from each State in 78th and subsequent Congresses
§ 2c. Number of Congressional Districts; number of Representatives from each District
§ 5. Nominations for Representatives at large