The 1818–19 United States House of Representatives elections were held on various dates in various states between April 26, 1818, and August 12, 1819. Each state set its own date for its elections to the House of Representatives before the first session of the 16th United States Congress convened on December 6, 1819. They occurred during President James Monroe's first term. Also, newly admitted Alabama elected its first representatives in September 1819, increasing the size of the House to 186 seats.

This election occurred in a politically uneventful period marked by exceptionally low levels of partisan rivalry known as the Era of Good Feelings. The weak Federalist Party, with limited influence in few states, no longer effectively opposed the Democratic-Republican Party, which increased its large majority.

Election summaries Illinois was admitted in 1818, adding one seat.

Alabama and Maine were admitted during the 16th Congress. One new seat was added for Alabama, while Maine, splitting from Massachusetts, simply retained its Representatives.

+ ↓ 158 28 Democratic-Republican Federalist

State Type ↑ Date Totalseats Democratic-Republican Federalist Seats Change Seats Change New York Districts April 28–30, 1818 27 21 1 6 1 Louisiana At-large July 6–8, 1818 1 1 0 Indiana At-large August 3, 1818 1 1 0 Kentucky Districts August 3, 1818 10 10 0 Rhode Island At-large August 25, 1818 2 2 2 0 2 Vermont At-large September 1, 1818 6 6 0 Connecticut At-large September 21, 1818 7 7 7 0 7 Delaware At-large October 5, 1818 2 1 1 Georgia At-large October 5, 1818 6 6 0 Maryland Districts October 5, 1818 9 6 1 3 1 South Carolina Districts October 12–13, 1818 9 9 0 New Jersey At-large October 13, 1818 6 6 0 Ohio Districts October 13, 1818 6 5 1 Pennsylvania Districts October 13, 1818 23 19 4 Massachusetts Districts November 2, 1818 20 13 4 7 4 Late elections (after the March 4, 1819 beginning of the term) Virginia Districts April 1819 23 20 3 New Hampshire At-large March 9, 1819 6 6 0 Illinois At-large August 2, 1819 1 1 0 Mississippi At-large August 2–3, 1819 1 1 0 Tennessee Districts August 5–6, 1819 6 6 0 North Carolina Districts August 12, 1819 13 10 1 3 1 Alabama At-large September 20–21, 1819 1 1 1 0 Total of regular elections 186 158 13 28 12

Special elections

There were special elections in 1818 and 1819 to the 15th United States Congress and 16th United States Congress.

Special elections are sorted by date then district.

15th Congress

! | Uriel Holmes | | Federalist | 1816 | | Incumbent resigned sometime in 1818.New member elected before November 1818 and seated November 16, 1818.Democratic-Republican gain.Winner was not a candidate for the next term; see below. | nowrap |

! | colspan=3 | Vacant | | Member-elect Alexander McMillan died before this Congress began.New member elected January 1, 1818 and seated January 26, 1818.Democratic-Republican gain.Winner later lost re-election; see below. | nowrap |

! | John C. Calhoun | | Democratic-Republican | 1810 | | Incumbent resigned November 3, 1817 to become U.S. Secretary of War.New member elected in January 1818 and seated February 9, 1818.Democratic-Republican hold.Winner later re-elected; see below. | nowrap |

! | Albion K. Parris | | Democratic-Republican | 1814 | | Incumbent resigned February 3, 1818.New member elected March 16, 1818 and seated November 16, 1818.Democratic-Republican hold.Winner later re-elected; see below. | nowrap |

! | John Ross | | Democratic-Republican | 1808 | | Incumbent resigned February 24, 1818 to become President Judge of Pennsylvania's 7th Judicial Circuit.New member elected March 3, 1818 and seated March 24, 1818.Democratic-Republican hold.Winner resigned July 6, 1818; see below. | nowrap |

! | Jacob Spangler | | Democratic-Republican | 1816 | | Incumbent resigned April 20, 1818.New member elected between April and November 1818 and seated November 16, 1818.Democratic-Republican hold.Winner also elected to the next term; see below. | nowrap |

! | Thomas B. Robertson | | Democratic-Republican | 1812 | | Incumbent resigned April 20, 1818.New member elected July 6–8, 1818 and seated November 16, 1818.Democratic-Republican hold.Winner also elected to the next term; see below. | nowrap |

! | Samuel D. Ingham | | Democratic-Republican | 1818 | | Incumbent resigned July 6, 1818.New member elected October 13, 1818 and seated November 16, 1818.Democratic-Republican hold.Winner also elected to the next term; see below. | nowrap |

! | Daniel Forney | | Democratic-Republican | 1815 | | Incumbent resigned in 1818.New member elected November 7, 1818 and seated December 2, 1818.Federalist gain.Winner later re-elected; see below. | nowrap |

! | Peterson Goodwyn | | Democratic-Republican | 1803 | | Incumbent died February 21, 1818.New member elected November 16, 1818 and seated April 21, 1818.Democratic-Republican hold.Winner later lost re-election; see below. | nowrap |

! | John Forsyth | | Democratic-Republican | 1812 | | Incumbent resigned November 23, 1818 when elected U.S. Senator.New member elected January 4, 1819 and seated February 18, 1819 both to finish the term and to the next term.Democratic-Republican hold. | nowrap |

! | George Mumford | | Democratic-Republican | 1817 | | Incumbent died December 31, 1818.New member elected between January 1, 1819, and February 11, 1819, and seated February 11, 1819.Democratic-Republican hold.Winner was later re-elected to the next term; see below. | nowrap |

16th Congress

| colspan=6 |

Alabama

! | colspan=3 | None (new state) | | Alabama was admitted as a state December 14, 1819.Incumbent territorial delegate re-elected as member and seated December 14, 1819.Democratic-Republican gain. | nowrap |

Alabama Territory See Non-voting delegates, below.

Arkansas Territory See Non-voting delegates, below.

Connecticut

Connecticut elected its members September 21, 1818. The delegation changed from seven Federalists to seven Democratic-Republicans then the retirement of six incumbents and the party-change of the seventh.

! rowspan=7 | | Ebenezer Huntington | | Federalist | 1817 | | Incumbent retired.Democratic-Republican gain. | rowspan=7 nowrap |

| Jonathan O. Moseley | | Federalist | 1804 | | Incumbent changed parties and re-elected.Democratic-Republican gain.

| Samuel B. Sherwood | | Federalist | 1816 | | Incumbent retired.Democratic-Republican gain.

| Timothy Pitkin | | Federalist | 1805 | | Incumbent retired.Democratic-Republican gain.

| Nathaniel Terry | | Federalist | 1817 | | Incumbent retired.Democratic-Republican gain.

| Thomas Scott Williams | | Federalist | 1816 | | Incumbent retired.Democratic-Republican gain.

| Uriel Holmes | | Federalist | 1816 | | Incumbent resigned sometime in 1818.Democratic-Republican gain.Successor was not elected to finish the term.

Delaware

Delaware elected its members October 5, 1818.

! rowspan=2 | | Louis McLane | | Federalist | 1816 | Incumbent re-elected. | rowspan=2 nowrap |

| Willard Hall | | Democratic-Republican | 1816 | Incumbent re-elected.

Georgia

Georgia elected its members October 5, 1818.

! rowspan=6 | | William Terrell | | Democratic-Republican | 1816 | Incumbent re-elected. | rowspan=6 nowrap |

| Joel Crawford | | Democratic-Republican | 1816 | Incumbent re-elected.

| Joel Abbot | | Democratic-Republican | 1816 | Incumbent re-elected.

| Zadock Cook | | Democratic-Republican | 1816 | | Incumbent retired.Democratic-Republican hold.

| John Forsyth | | Democratic-Republican | 1812 | Incumbent re-elected but declined the seat and resigned November 23, 1818, having been elected U.S. Senator, leading to a special election.

| Thomas W. Cobb | | Democratic-Republican | 1816 | Incumbent re-elected.

Illinois

Illinois elected its member August 2, 1819, after the new congress began but before the first session convened. The incumbent had just been elected to the new seat in late 1818.

15th Congress

! | colspan=3 | None (new state) | | Illinois was admitted December 3, 1818.New member elected in 1818 and seated December 4, 1818 to finish the term ending March 3, 1819.Democratic-Republican gain.The next year, the winner lost re-election; see below. | nowrap |

16th Congress

! | John McLean | | Democratic-Republican | 1818 | | Incumbent lost re-election.Democratic-Republican hold. | nowrap |

Indiana

Indiana re-elected its member August 3, 1818.

! | William Hendricks | | Democratic-Republican | 1816 | Incumbent re-elected. | nowrap |

Kentucky

Kentucky elected its members August 3, 1818.

! | David Trimble | | Democratic-Republican | 1816 | Incumbent re-elected. | nowrap |

! | Henry Clay | | Democratic-Republican | 18101814 18141815 1815 | Incumbent re-elected. | nowrap |

! | Richard M. Johnson | | Democratic-Republican | 1806 | | Incumbent retired.Democratic-Republican hold. | nowrap |

! | Joseph Desha | | Democratic-Republican | 1806 | | Incumbent lost re-election.Democratic-Republican hold. | nowrap |

! | Anthony New | | Democratic-Republican | 18101814 1816 | | Incumbent retired.Democratic-Republican hold. | nowrap |

! | David Walker | | Democratic-Republican | 1816 | Incumbent re-elected. | nowrap |

! | George Robertson | | Democratic-Republican | 1816 | Incumbent re-elected. | nowrap |

! | Richard C. Anderson Jr. | | Democratic-Republican | 1816 | Incumbent re-elected. | nowrap |

! | Tunstall Quarles | | Democratic-Republican | 1816 | Incumbent re-elected. | nowrap |

! | Thomas Speed | | Democratic-Republican | 1816 | | Incumbent retired.Democratic-Republican hold. | nowrap |

Louisiana

Louisiana elected its member July 6–8, 1818.

Louisiana held an election for the 16th Congress at the same time that it held a special election to finish the 15th Congress. Data were only available for the special election, but the general election would presumably have had very similar results, and so the results for the special election are duplicated here.

! | Thomas B. Robertson | | Democratic-Republican | 1812 | | Incumbent resigned April 20, 1818.Democratic-Republican hold.Successor elected the same day to finish the current term; see above. | nowrap |

Maryland

Maryland elected its members October 5, 1818.

! | Philip Stuart | | Federalist | 1810 | | Incumbent retired.Federalist hold. | nowrap |

! | John C. Herbert | | Federalist | 1814 | | Incumbent retired.Democratic-Republican gain. | nowrap |

! | George Peter | | Federalist | 1816 | | Incumbent lost re-election.Federalist hold. | nowrap |

! | Samuel Ringgold | | Democratic-Republican | 18101814 1816 | Incumbent re-elected. | nowrap |

! rowspan=2 | | Samuel Smith | | Democratic-Republican | 17921803 1816 | Incumbent re-elected. | rowspan=2 nowrap |

| Peter Little | | Democratic-Republican | 18101812 1816 | Incumbent re-elected.

! | Philip Reed | | Democratic-Republican | 1816 | | Incumbent lost re-election.Democratic-Republican hold. | nowrap |

! | Thomas Culbreth | | Democratic-Republican | 1816 | Incumbent re-elected. | nowrap |

! | Thomas Bayly | | Federalist | 1816 | Incumbent re-elected. | nowrap |

Massachusetts

Massachusetts elected its members November 2, 1818. Massachusetts's electoral law required a majority for election, n Massachusetts's electoral law required a majority for electionMassachusetts's electoral law required a majority for electionecessitating additional elections in five districts on April 5, 1819, and July 26, 1819.

This was the last election in which the District of Maine — comprising congressional districts 14 through 20 — was part of Massachusetts. The District became the State of Maine during the 16th Congress.

District numbers differed between source used and elsewhere on Wikipedia; district numbers used elsewhere on Wikipedia used here.

! | Jonathan Mason | | Federalist | 1817 | Incumbent re-elected. | nowrap |

! | Nathaniel Silsbee | | Democratic-Republican