New York New York lost 6 seats, going from 40 to 34 members, but remaining the largest delegation. Its thirty-four members were elected November 8, 1842. |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |} North Carolina North Carolina lost 4 seats, going from 13 to 9 members. Elections were held August 3, 1843, after the March 4, 1843 beginning of the term. |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |} Ohio Ohio gained 2 seats, going from 19 to 21 members. Its twenty-one members were elected October 10, 1843, after the March 4, 1843 beginning of the term. |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |} Pennsylvania Pennsylvania lost 4 seats, going from 28 to 24 members. Its twenty-four members were elected October 10, 1843, after the March 4, 1843 beginning of the term. |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |- ! |} Rhode Island Rhode Island stayed at 2 seats, but elected its members from districts, having previously elected them at-large. Elections were held August 29, 1843, after the March 4, 1843 beginning of the term. |- ! | Robert B. Cranston | | Whig | 1837 | | Unknown if incumbent retired or lost re-election.New member elected.Law and Order gain. | nowrap | |- ! | Joseph L. Tillinghast | | Whig | 1837 | | Incumbent retired.New member elected.Law and Order gain. | nowrap | |} South Carolina South Carolina lost 2 seats, going from 9 to 7 members. Elections were held February 20–21, 1843. |- ! |- ! |-