Smith | | Democratic-Republican | 17921816 | | Incumbent re-elected (see below) but resigned December 22, 1822.New member elected January 1, 1823.Democratic-Republican hold.Successor also elected the same day to the next term, see below.Successor seated January 8, 1823. | nowrap | |} 18th Congress |- ! | Samuel Smith | | Democratic-Republican | 17921816 | | Incumbent re-elected (see below) but resigned December 22, 1822.New member elected January 1, 1823.Democratic-Republican hold.Successor also elected the same day to finish the term, see above.Successor seated with the rest of the House at the December 1, 1823 beginning of the first session. | nowrap | |- ! | William Eustis | | Democratic-Republican | 18001804 1820 18201822 | | Incumbent re-elected (see below) but declined the election.New member elected September 8, 1823.Democratic-Republican hold.Election was challenged and successor was not seated, leading to a new election. | nowrap | |- ! | William B. Rochester | | Adams Democratic-Republican | 1821 | | Incumbent resigned April 21, 1823 to become Judge of the New York's Eighth Circuit Court.New member elected in November 1823.Democratic-Republican hold.Successor was seated with the rest of the House at the December 1, 1823 beginning of the first session. | nowrap | |} Alabama Alabama increased from one to three seats in reapportionment following the 1820 United States Census. The state then changed from a single at-large district to three geographic districts. Alabama elected its members August 3, 1823, after the term began but before the new Congress convened. |- ! | Gabriel Moore | | Democratic-Republican | 1821 | Incumbent re-elected. | nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Democratic-Republican gain. | nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Democratic-Republican gain. | nowrap | |} Arkansas Territory See Non-voting delegates, below. Connecticut Connecticut lost one seat in reapportionment following the 1820 United States Census. Connecticut elected its members April 7, 1823, after the term began but before the new Congress convened. |- ! rowspan=7 | | Noyes Barber | | Democratic-Republican | 1821 | Incumbent re-elected. | rowspan=6 nowrap | |- | Ebenezer Stoddard | | Democratic-Republican | 1821 | Incumbent re-elected. |- | Gideon Tomlinson | | Democratic-Republican | 1818 | Incumbent re-elected. |- | Ansel Sterling | | Democratic-Republican | 1821 | Incumbent re-elected. |- | John Russ | | Democratic-Republican |