1848–49 United States House of Representatives elections

States held the 1848–49 United States House of Representatives elections between August 7, 1848, and November 11, 1849. Each state set a date for its elections to the House of Representatives before the first session of the 31st United States Congress convened on December 3, 1849. The new U.S. state of Wisconsin elected its first Representatives. Anticipating statehood, as ratified in September 1850, California held Federal elections beforehand, increasing the size of the House to 233 seats.

These elections spanned the 1848 United States presidential election and took place immediately after the U.S. victory over Mexico in the Mexican–American War. The Whigs lost their House majority as Democrats, whose support had driven the war, won a plurality. Among minor parties, the new Free Soil Party, which opposed slavery in the Western territories, won nine Northern seats, while the American or Know Nothing Party retained one.

Despite winning most of their seats at Whig expense, the Free Soil Party had coalesced in 1848 largely as a result of a Democratic Party split in New York, the most populous state. The new party thus drove an unusual Whig sweep in New York elections, temporarily masking Whig decline.

After a gold discovery in January 1848, California boomed, drawing rapid migration of new residents and creating immediate pressure for statehood. The Compromise of 1850, though largely crafted in the Senate, was also passed by the House, brokering its admission to the Union.

As no party held a majority when Congress convened, the election of a Speaker proved contentious. The Whigs were sectionally split, with Northern Whigs nominating incumbent speaker Robert C. Winthrop of Massachusetts and Southern Whigs supporting Meredith P. Gentry of Tennessee. Democrats primarily supported Howell Cobb of Georgia; 13 other Democratic hopefuls also garnered support. The small Free Soil Party supported David Wilmot of Pennsylvania, author of the Wilmot Proviso, calling attention to slave power's hold over both major parties.

After nearly three weeks of heated debate, the House suspended its majority rule for the Speaker election, enabling Cobb to be elected on the 63rd ballot by plurality.

Results + ↓ 113 1 10 107 Democratic Whig

State Type Date Totalseats Democratic Free Soil Whig Other Seats Change Seats Change Seats Change Seats Change Arkansas At-large August 7, 1848 1 1 0 0 0 Illinois District August 7, 1848 7 5 1 0 1 0 1 Iowa District August 7, 1848 2 2 0 0 0 Missouri District August 7, 1848 5 5 0 0 0 Vermont District September 5, 1848 4 1 0 3 0 Maine District September 11, 1848 7 5 1 0 2 1 0 Florida At-large October 2, 1848 1 0 0 1 0 Georgia District October 2, 1848 8 4 0 4 0 South Carolina District October 9–10, 1848 7 7 0 0 0 Ohio District October 10, 1848 21 11 1 2 2 8 3 0 Pennsylvania District October 10, 1848 24 10 3 0 13 3 1 Delaware At-large November 6, 1848 1 0 0 1 0 Michigan District November 7, 1848(Election Day) 3 2 1 0 1 1 0 New Jersey District 5 1 0 4 0 New York District 34 1 9 1 1 31 8 1 Wisconsin District 3 1 1 1 1 1 1 0 Massachusetts District November 13, 1848 10 0 1 1 8 2 0 Late elections, after the March 4, 1849 beginning of the term New Hampshire District March 13, 1849 4 2 1 1 1 0 1 Connecticut District April 2, 1849 4 2 2 1 1 1 3 0 Rhode Island District April 4, 1849 2 0 1 0 2 1 0 Virginia District April 26, 1849 15 13 4 0 2 4 0 Tennessee District August 2, 1849 11 7 1 0 4 1 0 Alabama District August 6, 1849 7 5 0 2 0 Indiana District August 6, 1849 10 8 2 1 1 1 3 0 Kentucky District August 6, 1849 10 4 0 6 0 Texas District August 6, 1849 2 2 0 0 0 North Carolina District August 7, 1849 9 3 0 6 0 Maryland District October 3, 1849 6 3 1 0 3 1 0 Louisiana District November 5, 1849 4 3 0 1 0 Mississippi District November 5–6, 1849 4 4 1 0 0 1 0 California At-large November 11, 1849 2 1 1 0 0 1 1 Total 231 113 3 8 8 107 9 2

New seats An additional seat was apportioned to Wisconsin. Two seats were allocated to California upon its admission on September 9, 1850, increasing the size of the House to 233 seats.

Special elections

30th Congress

! | John W. Hornbeck | | Whig | 1846 | | Incumbent died January 16, 1848.New member elected February 23, 1848.Democratic gain.Winner was not a candidate for the next term; see below. | nowrap |

! | John Quincy Adams | | Whig | 1830 | | Incumbent died February 23, 1848.New member elected April 3, 1848.Whig hold.Winner later re-elected to the next term; see below. | nowrap |

! | James A. Black | | Democratic | 1843 | | Incumbent died April 3, 1848.New member elected May 23, 1848.Democratic hold.Winner later re-elected to the next term; see below. | nowrap |

! | John Hubbard Tweedy | | Whig | 1846 | | Incumbent resigned May 28, 1848, after Wisconsin became a state.New delegate elected October 30, 1848.Democratic gain.Winner later re-elected in the Minnesota Territory's at-large district; see below. | nowrap |

! | David S. Jackson | | Democratic | 1846 | | Seat declared vacant on April 19, 1848, following an election contest centered on voter fraud.New member elected November 7, 1848.Whig gain.Winner not elected the same day to the next term; see below. | nowrap |

! | John M. Holley | | Whig | 1846 | | Incumbent died March 8, 1848.New member elected November 7, 1848.Whig hold.Winner not elected the same day to the next term; see below. | nowrap |

! | Alexander D. Sims | | Democratic | 1844 | | Incumbent died November 22, 1848.New member elected January 9, 1849.Democratic hold.Winner later re-elected to the next term; see below. | nowrap |

31st Congress

! | Alexander D. Sims | | Democratic | 1844 | | Incumbent had been re-elected, see below, but died November 22, 1848.New member elected January 16, 1849.Democratic hold.Winner had already been elected to finish the current term; see above. | nowrap |

! | George P. Marsh | | Whig | 1843 | | Incumbent resigned May 29, 1849, when appointed U.S. Minister Resident to the Ottoman Empire.New member elected September 4, 1849.Whig hold.Winner later re-elected to the next term. | nowrap |

! | Rodolphus Dickinson | | Democratic | 1846 | | Incumbent died March 20, 1849.New member elected October 9, 1849.Democratic hold.Winner died the following year, leading to another special election. | nowrap |

! | Alexander Newman | | 1849 | | Incumbent died September 8, 1849.New member elected November 8, 1849.Whig gain.Winner later lost re-election to the next term. | nowrap |

Alabama

Elections were held August 6, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

! | John Gayle | | Whig | 1847 | | Incumbent retired.Whig hold. | nowrap |

! | Henry W. Hilliard | | Whig | 1845 | Incumbent re-elected. | nowrap |

! | Sampson Willis Harris | | Democratic | 1847 | Incumbent re-elected. | nowrap |

! | Samuel Williams Inge | | Democratic | 1847 | Incumbent re-elected. | nowrap |

! | George S. Houston | | Democratic | 1841 | | Incumbent retired.Democratic hold. | nowrap |

! | Williamson R. W. Cobb | | Democratic | 1847 | Incumbent re-elected. | nowrap |

! | Franklin W. Bowdon | | Democratic | 1846 | Incumbent re-elected. | nowrap |

Arkansas

The election was held August 7, 1848.

! | Robert Ward Johnson | | Democratic | 1846 | Incumbent re-elected. | nowrap |

California

In California two at-large members were elected November 13, 1849 in anticipation of statehood and seated September 11, 1850.

! rowspan=2 | | colspan=3 | None (new state) | | New seat.Independent gain. | rowspan=2 nowrap |

| colspan=3 | None (new state) | | New seat.Democratic gain.

Connecticut

Elections were held April 2, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

! | James Dixon | | Whig | 1845 | | Incumbent retired.Democratic gain. | nowrap |

! | Samuel D. Hubbard | | Whig | 1845 | | Incumbent lost re-election.Free Soil gain. | nowrap |

! | John A. Rockwell | | Whig | 1845 | | Incumbent lost re-election.Democratic gain. | nowrap |

! | Truman Smith | | Whig | 18391843 1845 | | Incumbent retired to run for U.S. Senate.Whig hold. | nowrap |

Delaware

The election was held November 6, 1848.

! | John W. Houston | | Whig | 1844 | Incumbent re-elected. | nowrap |

Florida

Florida's single at-large member was elected October 2, 1848.

! | Edward C. Cabell | | Whig | 1845 1846 1846 | Incumbent re-elected. | nowrap |

Georgia

Elections were held October 2, 1848.

! | T. Butler King | | Whig | 18381842 1844 | Incumbent re-elected. | nowrap |

! | Alfred Iverson Sr. | | Democratic | 1846 | | Incumbent retired.Democratic hold. | nowrap |

! | John William Jones | | Whig | 1846 | | Incumbent retired.Whig hold. | nowrap |

! | Hugh A. Haralson | | Democratic | 1842 | Incumbent re-elected. | nowrap |

! | John H. Lumpkin | | Democratic | 1842 | | Incumbent retired.Democratic hold. | nowrap |

! | Howell Cobb | | Democratic | 1842 | Incumbent re-elected. | nowrap |

! | Alexander H. Stephens | | Whig | 1843 | Incumbent re-elected. | nowrap |

! | Robert Toombs | | Whig | 1844 | Incumbent re-elected. | nowrap |

Illinois

Elections were held August 7, 1848.

! | Robert Smith | | IndependentDemocratic | 1842 | | Incumbent retired.Democratic gain. | nowrap |

! | John Alexander McClernand | | Democratic | 1842 | Incumbent re-elected. | nowrap |

! | Orlando B. Ficklin | | Democratic | 1842 | | Incumbent retired.Democratic hold. | nowrap |

! | John Wentworth | | Democratic | 1842 | Incumbent re-elected. | nowrap |

! | William Alexander Richardson | | Democratic | 1847 | Incumbent re-elected. | nowrap |

! | Thomas J. Turner | | Democratic | 1846 | | Incumbent retired.Whig gain. | nowrap |

! | Abraham Lincoln | | Whig | 1846 | | Incumbent retired.Democratic gain. | nowrap |

Indiana

Elections were held August 10, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

! | Elisha Embree | | Whig | 1847 | | Incumbent lost re-election.Democratic gain. | nowrap |

! | Thomas J. Henley | | Democratic | 1843 | | Incumbent retired.Democratic hold. | nowrap |

! | John L. Robinson | | Democratic | 1847 | Incumbent re-elected. | nowrap |

! | Caleb B. Smith | | Whig | 1843 | | Incumbent retired.Free Soil gain. | nowrap |

! | William W. Wick | | Democratic | 18391841 1845 | | Incumbent retired.Democratic hold. | nowrap |

! | George G. Dunn | | Whig | 1847 | | Incumbent retired.Democratic gain. | nowrap |

! | Richard W. Thompson | | Whig | 18411843 1847 | | Incumbent renominated but withdrew.Whig hold. | nowrap |

! | John Pettit | | Democratic | 1843 | | Incumbent lost renomination.Democratic hold. | nowrap |

! | Charles W. Cathcart | | Democratic | 1845 | | Incumbent retired.Democratic hold. | nowrap |

! | William R. Rockhill | | Democratic | 1847 | | Incumbent retired.Democratic hold. | nowrap |

Iowa

Elections were held August 7, 1848.

! | William Thompson | | Democratic | 1847 | Incumbent re-elected. | nowrap |

! | Shepherd Leffler | | Democratic | 1846 | Incumbent re-elected. | nowrap |

Kentucky

Elections were held August 6, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

! | Linn Boyd | | Democratic | 18351837 1839 | Incumbent re-elected. | nowrap |

! | Samuel Peyton | | Democratic | 1847 | | Incumbent retired.Whig gain. | nowarap |

! | Beverly L. Clarke | | Democratic | 1847 | | Incumbent retired.Whig gain. | nowarap |

! | Aylette Buckner | | Whig | 1847 | | Incumbent lost re-election.Democratic gain. | nowrap |

! | John Burton Thompson | | Whig | 1840 1843 1847 | Incumbent re-elected. | nowrap |

! | Green Adams | | Whig | 1847 | | Incumbent retired.Whig hold. | nowrap |

! | Garnett Duncan | | Whig | 1847