# 1866–67 United States House of Representatives elections

The 1866–67 United States House of Representatives elections were held on various dates in various states between June 4, 1866, and September 6, 1867. They occurred during President Andrew Johnson's term just one year after the American Civil War ended when the Union defeated the Confederacy. Each state set its own date for its elections to the House of Representatives. Members were elected before or after the first session of the 40th United States Congress convened on March 4, 1867, including the at-large seat from the new state of Nebraska. Ten secessionist states still had not yet been readmitted, and therefore were not seated.
The 1866 elections were a decisive event in the early Reconstruction era, in which President Johnson faced off against the Radical Republicans in a bitter dispute over whether Reconstruction should be lenient or harsh toward the vanquished white South.
Most of the congressmen from the former Confederate states were either prevented from leaving the state or were arrested on the way to the capital. A Congress consisting of mostly Radical Republicans sat early in the Capitol and aside from the delegation from Tennessee who were allowed in, the few Southern Congressmen who arrived were not seated.

## Background

Johnson, a War Democrat, had been elected Vice President in the 1864 presidential election as the running mate of Abraham Lincoln, a Republican. (The Republicans had chosen not to re-nominate Hannibal Hamlin for a second term as vice president).
Lincoln and Johnson ran together under the banner of the National Union Party, which brought together Republicans (with the exception of some hard-line abolitionist Radical Republicans who backed John C. Frémont, who eventually dropped out of the race after brokering a deal with Lincoln) and the War Democrats (the minority of Democrats who backed Lincoln's prosecution of the war, as opposed to the Peace Democrats, or Copperheads, who favored a negotiated settlement with the Confederates).
After the assassination of Lincoln, Johnson became president. He immediately became embroiled in a dispute with the Radical Republicans over the conditions of Reconstruction; Johnson favored a lenient Reconstruction, while Radical Republicans wanted to continue the military occupation of the South and force Southern states to give freedmen (the newly freed slaves) civil rights (and the right to vote).

## Campaign and results

Johnson stumped the country in a public speaking tour known as the Swing Around the Circle; he generally supported Democrats but his speeches were poorly received.
The Republicans won in a landslide, capturing enough seats to override Johnson's vetoes. Only the border states of Delaware, Maryland, and Kentucky voted for Democrats. Recently Reconstructed Tennessee sent a Republican delegation. The other 10 ex-Confederate states did not vote. As a percentage of the total number of seats available in the House of Representatives, the Republican majority attained in the election of 1866 has never been exceeded in any subsequent Congress. The Democratic Party was able to achieve similar success only in the political environment of the era of the Great Depression in the 1930s.

## Election summaries

Seven secessionist states were readmitted during this Congress, filling 32 vacancies, but are not included in this table if they were not elected within 1866 through 1867.
| 44 | 4 | 147 |
| Democratic | | Republican |
| State | Type | Date | Total seats | Democratic | Democratic | Conservative | Conservative | Republican | Republican | Others | Others |
| State | Type | Date | Total seats | Seats | Change | Seats | Change | Seats | Change | Seats | Change |
| Oregon | At-large | June 4, 1866 | 1 | 0 | | 0 | | 1 | | 0 | |
| Vermont | Districts | Sep 4, 1866 | 3 | 0 | | 0 | | 3 | | 0 | |
| Maine | Districts | Sep 10, 1866 | 5 | 0 | | 0 | | 5 | | 0 | |
| Indiana | Districts | Oct 9, 1866 | 11 | 3 | 1 | 0 | | 8 | 1 | 0 | |
| Iowa | Districts | Oct 9, 1866 | 6 | 0 | | 0 | | 6 | | 0 | |
| Nebraska | At-large | Oct 9, 1866 | 1 | 0 | | 0 | | 1 | | 0 | |
| Ohio | Districts | Oct 9, 1866 | 19 | 2 | | 0 | | 17 | | 0 | |
| Pennsylvania | Districts | Oct 9, 1866 | 24 | 6 | 3 | 0 | | 18 | 3 | 0 | |
| West Virginia | Districts | Oct 25, 1866 | 3 | 0 | | 0 | | 3 | 3 | 0 | 3 |
| Delaware | At-large | Nov 6, 1866 (Election Day) | 1 | 1 | | 0 | | 0 | | 0 | |
| Illinois | District + 1 at-large | Nov 6, 1866 (Election Day) | 14 | 3 | | 0 | | 11 | | 0 | |
| Kansas | At-large | Nov 6, 1866 (Election Day) | 1 | 0 | | 0 | | 1 | | 0 | |
| Maryland | Districts | Nov 6, 1866 (Election Day) | 5 | 3 | 1 | 1 | 1 | 1 | 1 | 0 | 3 |
| Massachusetts | Districts | Nov 6, 1866 (Election Day) | 10 | 0 | | 0 | | 10 | | 0 | |
| Michigan | Districts | Nov 6, 1866 (Election Day) | 6 | 0 | | 0 | | 6 | | 0 | |
| Minnesota | Districts | Nov 6, 1866 (Election Day) | 2 | 0 | | 0 | | 2 | | 0 | |
| Missouri | Districts | Nov 6, 1866 (Election Day) | 9 | 1 | | 0 | | 8 | | 0 | |
| Nevada | At-large | Nov 6, 1866 (Election Day) | 1 | 0 | | 0 | | 1 | | 0 | |
| New Jersey | Districts | Nov 6, 1866 (Election Day) | 5 | 2 | 1 | 0 | | 3 | 1 | 0 | |
| New York | Districts | Nov 6, 1866 (Election Day) | 31 | 10 | 1 | 0 | | 21 | 1 | 0 | |
| Wisconsin | Districts | Nov 6, 1866 (Election Day) | 6 | 1 | | 0 | | 5 | | 0 | |
| Late elections (after the March 4, 1867 beginning of Congress) ||||||||||||
| New Hampshire | Districts | Mar 12, 1867 | 3 | 0 | | 0 | | 3 | | 0 | |
| Connecticut | Districts | Apr 1, 1867 | 4 | 3 | 3 | 0 | | 1 | 3 | 0 | |
| Rhode Island | Districts | Apr 3, 1867 | 2 | 0 | | 0 | | 2 | | 0 | |
| Kentucky | Districts | May 4, 1867 | 9 | 7 | 2 | 0 | | 1 | 1 | 0 | 4 |
| Tennessee | Districts | Aug 3, 1867 | 8 | 0 | | 0 | | 8 | 8 | 0 | 8 |
| California | Districts | Sep 6, 1867 | 3 | 2 | 2 | 0 | | 1 | 2 | 0 | |
| Secessionist states not yet readmitted ||||||||||||
| Alabama | Districts | — | 6 | 0 | | 0 | | 0 | | 0 | |
| Arkansas | Districts | — | 3 | 0 | | 0 | | 0 | | 0 | |
| Florida | At-large | — | 1 | 0 | | 0 | | 0 | | 0 | |
| Georgia | Districts | — | 7 | 0 | | 0 | | 0 | | 0 | |
| Louisiana | Districts | — | 5 | 0 | | 0 | | 0 | | 0 | |
| Mississippi | Districts | — | 5 | 0 | | 0 | | 0 | | 0 | |
| North Carolina | Districts | — | 7 | 0 | | 0 | | 0 | | 0 | |
| South Carolina | Districts | — | 4 | 0 | | 0 | | 0 | | 0 | |
| Texas | Districts | — | 4 | 0 | | 0 | | 0 | | 0 | |
| Virginia | Districts | — | 8 | 0 | | 0 | | 0 | | 0 | |
| Total | Total | Total | 193 | 44 22.8% | 4 | 1 0.5% | 1 | 147 76.2% | 12 | 0 0.0% | 18 |
Popular vote
Republican
55.36%
Democratic
40.69%
Conservative
2.00%
Independent
1.76%
Others
0.19% :
House seats
Republican
77.23%
Democratic
20.98%
Conservative
0.89%
Independent
0.89% :
The party affiliations of the 4 Representatives elected in Texas's rejected elections are unknown.

## Special elections
### 39th Congress

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Kentucky 5 | Lovell Rousseau | Unconditional Unionist | 1865 | Incumbent resigned July 21, 1866 following his assault of Josiah Grinnell. Incumbent re-elected September 15, 1866. Unconditional Unionist hold. | ▌Y Lovell Rousseau (Unconditional Unionist) 99.0% |
| Kentucky 6 | Green C. Smith | Unconditional Unionist | 1861 | Incumbent resigned July 13, 1866 to become Governor of Montana Territory. New member elected September 15, 1866. Democratic gain. | ▌Y Andrew H. Ward (Democratic) 89.2% ▌R. R. Carpenter (Unknown) 10.8% |
| Kentucky 3 | Henry Grider | Democratic | 1861 | Incumbent died September 7, 1866. New member elected October 6, 1866. Democratic hold. | ▌Y Elijah Hise (Democratic) 74.3% ▌P. B. Hawkins (National Union) 25.7% |
| New York 3 | James Humphrey | Republican | 1864 | Incumbent died June 16, 1866. New member elected November 6, 1866. Democratic gain. | ▌Y John W. Hunter (Democratic) 54.4% ▌Simeon B. Chittenden (Republican) 45.6% |

### 40th Congress

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Kentucky 3 | Elijah Hise | Democratic | 1866 (special) | Incumbent died May 6, 1867. New member elected August 5, 1867. Democratic hold. | ▌Y Jacob Golladay (Democratic) 76.6% ▌J. R. Curd (Republican) 13.6% ▌W. T. Jackman (Independent) 9.8% |
| Ohio 2 | Rutherford B. Hayes | Republican | 1864 | Incumbent resigned July 20, 1867 to run for Governor of Ohio. New member elected October 8, 1867. Independent Republican gain. | ▌Y Samuel F. Cary (Independent Republican) 52.1% ▌Richard Smith (Republican) 47.3% ▌ Charles Reemelin (Democratic) 0.6% |
| Pennsylvania 12 | Charles Denison | Democratic | 1862 | Incumbent died June 27, 1867. New member elected October 8, 1867. Democratic hold. | ▌Y George W. Woodward (Democratic) 51.2% ▌Winthrop W. Ketcham (Republican) 48.8% |
| Missouri 3 | Thomas E. Noell | Democratic | 1864 | Incumbent died October 3, 1867. New member elected November 5, 1867. Democratic hold. | ▌Y James R. McCormick (Democratic) 52.7% ▌James H. Chase (Republican) 47.3% |
| New York 21 | Roscoe Conkling | Republican | 1864 | Incumbent resigned March 3, 1867 when elected U.S. senator. New member elected November 5, 1867. Republican hold. | ▌Y Alexander H. Bailey (Republican) 51.5% ▌John Stryker (Democratic) 48.5% |

## California

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| California 1 | Donald C. McRuer | Republican | 1864 | Incumbent retired. Democratic gain. | ▌Y Samuel Beach Axtell (Democratic) 57.3% ▌Timothy Guy Phelps (Republican) 42.7% |
| California 2 | William Higby | Republican | 1863 | Incumbent re-elected. | ▌Y William Higby (Republican) 52.1% ▌James W. Coffrot (Democratic) 47.9% |
| California 3 | John Bidwell | Republican | 1864 | Incumbent retired. Democratic gain. | ▌Y James A. Johnson (Democratic) 50.6% ▌Chancellor Hartson (Republican) 49.4% |

## Colorado Territory

See non-voting delegates, below.

## Connecticut

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Connecticut 1 | Henry C. Deming | Republican | 1863 | Incumbent lost re-election. Democratic gain. | ▌Y Richard D. Hubbard (Democratic) 51.1% ▌Henry C. Deming (Republican) 48.9% |
| Connecticut 2 | Samuel L. Warner | Republican | 1861 | Incumbent retired. Democratic gain. | ▌Y Julius Hotchkiss (Democratic) 53.2% ▌Cyrus Northrop (Republican) 47.6% |
| Connecticut 3 | Augustus Brandegee | Republican | 1863 | Incumbent retired. Republican hold. | ▌Y Henry H. Starkweather (Republican) 55.4% ▌Earl Martin (Democratic) 44.6% |
| Connecticut 4 | John Henry Hubbard | Republican | 1863 | Incumbent lost renomination. Democratic gain. | ▌Y William Barnum (Democratic) 51.9% ▌P. T. Barnum (Republican) 48.0% |

## Dakota Territory

See non-voting delegates, below.

## Idaho Territory

See non-voting delegates, below.

## Massachusetts

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Massachusetts 1 | Thomas D. Eliot | Republican | 1858 | Incumbent re-elected. | ▌Y Thomas D. Eliot (Republican) 84.17% ▌Matthias Elias (Democratic) 15.83% |
| Massachusetts 2 | Oakes Ames | Republican | 1862 | Incumbent re-elected. | ▌Y Oakes Ames (Republican) 79.60% ▌Abijah M. Ide (Democratic) 20.40% |
| Massachusetts 3 | Alexander H. Rice | Republican | 1858 | Incumbent retired. Republican hold. | ▌Y Ginery Twichell (Republican) 66.51% ▌William Henry Aspinwall (Democratic) 28.43% ▌P. R. Quincy (Workingman) 5.06% |
| Massachusetts 4 | Samuel Hooper | Republican | 1861 (special) | Incumbent re-elected. | ▌Y Samuel Hooper (Republican) 71.29% ▌Joseph M. Wightman (Democratic) 28.71% |
| Massachusetts 5 | John B. Alley | Republican | 1858 | Incumbent retired. Republican hold. | ▌Y Benjamin Butler (Republican) 76.07% ▌William D. Northend (Democratic) 23.93% |
| Massachusetts 6 | Nathaniel P. Banks | Republican | 1865 (special) | Incumbent re-elected. | ▌Y Nathaniel P. Banks (Republican) 74.96% ▌Frederick O. Prince (Democratic) 25.04% |
| Massachusetts 7 | George S. Boutwell | Republican | 1862 | Incumbent re-elected. | ▌Y George S. Boutwell (Republican) 77.34% ▌Leverett Saltonstall (Democratic) 22.66% |
| Massachusetts 8 | John D. Baldwin | Republican | 1862 | Incumbent re-elected. | ▌Y John D. Baldwin (Republican) 82.62% ▌William A. Williams (Democratic) 17.38% |
| Massachusetts 9 | William B. Washburn | Republican | 1862 | Incumbent re-elected. | ▌Y William B. Washburn (Republican) 87.06% ▌Levi Haywood (Democratic) 12.94% |
| Massachusetts 10 | Henry L. Dawes | Republican | 1856 | Incumbent re-elected. | ▌Y Henry L. Dawes (Republican) 66.00% ▌Abijah W. Chapin (Democratic) 34.00% |

## Montana Territory

See non-voting delegates, below.

## Nebraska

There were two elections in the new state of Nebraska in 1866: on June 6 for the remainder of the current term, and October 9 for the next term.

### 39th Congress

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Nebraska at-large | New state | New state | New state | New seat. Republican gain. New member seated March 2, 1867. | ▌Y Turner M. Marquett (Republican) 50.84% ▌John R. Brooke (Democratic) 49.16% |

### 40th Congress

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Nebraska at-large | Turner M. Marquett | Republican | 1866 | Incumbent retired. Republican hold. | ▌Y John Taffe (Republican) 54.02% ▌Algernon Paddock (Democratic) 45.64% |

## New Mexico Territory

See non-voting delegates, below.

## Ohio

Democrats gained one seat this election in Ohio. It was later contested and awarded to the Republican for a net gain of zero.
| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Ohio 1 | Benjamin Eggleston | Republican | 1864 | Incumbent re-elected. | ▌Y Benjamin Eggleston (Republican) 52.3% ▌George H. Pendleton (Democratic) 47.7% |
| Ohio 2 | Rutherford B. Hayes | Republican | 1864 | Incumbent re-elected. | ▌Y Rutherford B. Hayes (Republican) 56.2% ▌Theodore Cook (Democratic) 43.8% |
| Ohio 3 | Robert C. Schenck | Republican | 1862 | Incumbent re-elected. | ▌Y Robert C. Schenck (Republican) 51.8% ▌Durbin Ward (Democratic) 48.2% |
| Ohio 4 | William Lawrence | Republican | 1864 | Incumbent re-elected. | ▌Y William Lawrence (Republican) 54.6% ▌John F. McKinney (Democratic) 45.4% |
| Ohio 5 | Francis C. Le Blond | Democratic | 1862 | Incumbent retired. Democratic hold. | ▌Y William Mungen (Democratic) 55.4% ▌Moses B. Walker (Republican) 44.6% |
| Ohio 6 | Reader W. Clarke | Republican | 1864 | Incumbent re-elected. | ▌Y Reader W. Clarke (Republican) 53.0% ▌William Howard (Democratic) 47.0% |
| Ohio 7 | Samuel Shellabarger | Republican | 1864 | Incumbent re-elected. | ▌Y Samuel Shellabarger (Republican) 54.3% ▌Thomas Miller (Democratic) 45.7% |
| Ohio 8 | James Randolph Hubbell | Republican | 1864 | Incumbent retired. Republican hold. | ▌Y Cornelius S. Hamilton (Republican) 54.3% ▌William P. Reid (Democratic) 45.7% |
| Ohio 9 | Ralph P. Buckland | Republican | 1864 | Incumbent re-elected. | ▌Y Ralph P. Buckland (Republican) 52.2% ▌Thomas P. Finefrock (Democratic) 47.8% |
| Ohio 10 | James M. Ashley | Republican | 1862 | Incumbent re-elected. | ▌Y James M. Ashley (Republican) 53.4% ▌Henry S. Commager (Democratic) 46.6% |
| Ohio 11 | Hezekiah S. Bundy | Republican | 1864 | Incumbent retired. Republican hold. | ▌Y John T. Wilson (Republican) 56.2% ▌Oscar F. Moore (Democratic) 43.8% |
| Ohio 12 | William E. Finck | Democratic | 1862 | Incumbent retired. Democratic hold. | ▌Y Philadelph Van Trump (Democratic) 56.2% ▌Wells S. Jones (Republican) 43.8% |
| Ohio 13 | Columbus Delano | Republican | 1864 | Incumbent lost re-election Democratic gain. | ▌Y George W. Morgan (Democratic) 50.5% ▌Columbus Delano (Republican) 49.5% |
| Ohio 14 | Martin Welker | Republican | 1864 | Incumbent re-elected. | ▌Y Martin Welker (Republican) 53.4% ▌James B. Young (Democratic) 46.6% |
| Ohio 15 | Tobias A. Plants | Republican | 1864 | Incumbent re-elected. | ▌Y Tobias A. Plants (Republican) 54.5% ▌Martin Dewey Follett (Democratic) 45.6% |
| Ohio 16 | John Bingham | Republican | 1864 | Incumbent re-elected. | ▌Y John Bingham (Republican) 52.8% ▌Charles H. Mitchner (Democratic) 47.2% |
| Ohio 17 | Ephraim R. Eckley | Republican | 1862 | Incumbent re-elected. | ▌Y Ephraim R. Eckley (Republican) 60.0% ▌Louis Schaefer (Democratic) 40.0% |
| Ohio 18 | Rufus P. Spalding | Republican | 1862 | Incumbent re-elected. | ▌Y Rufus P. Spalding (Republican) 64.4% ▌Oliver Payne (Democratic) 35.6% |
| Ohio 19 | James A. Garfield | Republican | 1862 | Incumbent re-elected. | ▌Y James A. Garfield (Republican) 71.3% ▌David C. Coolman (Democratic) 28.7% |

## Tennessee

Elections held late, on August 1, 1867.
| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Tennessee 1 | Nathaniel G. Taylor | Unionist | 1865 | Incumbent retired. Republican gain. | ▌Y Roderick R. Butler (Republican) 86.82% ▌James White (Conservative) 12.85% ▌James Powell (Republican) 0.33% |
| Tennessee 2 | Horace Maynard | Unionist | 1865 | Incumbent re-elected as a Republican. Republican gain. | ▌Y Horace Maynard (Republican) 78.83% ▌John Williams (Conservative) 21.17% |
| Tennessee 3 | William B. Stokes | Unionist | 1865 | Incumbent re-elected as a Republican. Republican gain. | ▌Y William B. Stokes (Republican) 83.25% ▌Eli G. Fleming (Conservative) 16.75% |
| Tennessee 4 | Edmund Cooper | Unionist | 1865 | Incumbent lost re-election as a Conservative. Republican gain. | ▌Y James Mullins (Republican) 51.85% ▌Edmund Cooper (Conservative) 25.42% |
| Tennessee 5 | William B. Campbell | Unionist | 1865 | Incumbent retired. Republican gain. | ▌Y John Trimble (Republican) 72.09% ▌Balie Peyton (Conservative) 24.37% ▌D. H. Mason (Independent Republican) 3.54% |
| Tennessee 6 | Samuel M. Arnell | Unionist | 1865 | Incumbent re-elected as a Republican. Republican gain. | ▌Y Samuel M. Arnell (Republican) 77.79% ▌Dorsey B. Thomas (Conservative) 22.21% |
| Tennessee 7 | Isaac R. Hawkins | Unionist | 1865 | Incumbent re-elected as a Republican. Republican gain. | ▌Y Isaac R. Hawkins (Republican) 83.60% ▌William P. Coldwell (Conservative) 16.40% |
| Tennessee 8 | John W. Leftwich | Unionist | 1865 | Incumbent lost re-election as a Conservative. Republican gain. | ▌Y David A. Nunn (Republican) 59.41% ▌John W. Leftwich (Conservative) 40.59% |

## Utah Territory

See non-voting delegates, below.

## Vermont

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Vermont 1 | Frederick E. Woodbridge | Republican | 1863 | Incumbent re-elected. | ▌Y Frederick E. Woodbridge (Republican) 72.8% ▌Samuel Wells (Democratic) 27.1% |
| Vermont 2 | Justin S. Morrill | Republican | 1854 | Incumbent retired. Republican hold. | ▌Y Luke P. Poland (Republican) 72.2% ▌Charles M. Chase (Democratic) 26.2% Others ▌Peter T. Washburn (Republican) 0.4% ▌Hampden Cutts (Unknown) 0.3% ▌Julius Converse (Republican) 0.3% ▌D. C. Denison (Republican) 0.2% |
| Vermont 3 | Portus Baxter | Republican | 1860 | Incumbent lost re-election. Republican hold. | First ballot ▌Portus Baxter (Republican) 46.8% ▌Romeo H. Hoyt (Republican) 28.8% ▌Waldo Brigham (Democratic) 21.7% ▌J. S. Adams (Republican) 1.0% ▌J. H. Woodward (Republican) 0.6% ▌O. G. Wheeler (Republican) 0.5% Second ballot ▌Y Worthington C. Smith (Republican) 50.9% ▌Asa O. Aldis (Republican) 24.8% ▌Waldo Brigham (Democratic) 23.8% ▌Portus Baxter (Republican) 0.2% |

## Washington Territory

See non-voting delegates, below.

## West Virginia

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| West Virginia 1 | Chester D. Hubbard | Unconditional Unionist | 1864 | Incumbent re-elected as a Republican. Republican gain. | ▌Y Chester D. Hubbard (Republican) 54.83% ▌D. D. Johnson (Democratic) 45.17% |
| West Virginia 2 | George R. Latham | Unconditional Unionist | 1864 | Incumbent retired. Republican gain. | ▌Y Bethuel Kitchen (Republican) 61.30% ▌E. W. Andrews (Democratic) 38.35% ▌Daniel Polsley (Republican) 0.35% |
| West Virginia 3 | Kellian Whaley | Unconditional Unionist | 1863 | Incumbent retired. Republican gain. | ▌Y Daniel Polsley (Republican) 58.77% ▌John H. Oley (Democratic) 41.23% |

## Wisconsin

Wisconsin elected six members of congress on Election Day, November 4, 1866.
| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Member | Party | First elected | Results | Candidates |
| Wisconsin 1 | Halbert E. Paine | National Union | 1864 | Incumbent re-elected as a Republican. | ▌Y Halbert E. Paine (Republican) 58.8% ▌James S. Brown (Democratic) 41.2% |
| Wisconsin 2 | Ithamar Sloan | National Union | 1862 | Incumbent retired. Republican hold. | ▌Y Benjamin F. Hopkins (Republican) 61.5% ▌John J. Pease (Democratic) 38.5% |
| Wisconsin 3 | Amasa Cobb | National Union | 1862 | Incumbent re-elected as a Republican. | ▌Y Amasa Cobb (Republican) 62.9% ▌Noah Virgin (Democratic) 37.1% |
| Wisconsin 4 | Charles A. Eldredge | Democratic | 1862 | Incumbent re-elected. | ▌Y Charles A. Eldredge (Democratic) 56.6% ▌Orin Hatch (Republican) 43.4% |
| Wisconsin 5 | Philetus Sawyer | National Union | 1864 | Incumbent re-elected as a Republican. | ▌Y Philetus Sawyer (Republican) 60.5% ▌Morgan Lewis Martin (Democratic) 39.5% |
| Wisconsin 6 | Walter D. McIndoe | National Union | 1862 (special) | Incumbent retired. Republican hold. | ▌Y Cadwallader C. Washburn (Republican) 66.4% ▌Gilbert L. Park (Democratic) 33.6% |

## Non-voting delegates

| District | Incumbent | Incumbent | Incumbent | This race | This race |
| District | Delegate | Party | First elected | Results | Candidates |
| Colorado Territory at-large |
| Dakota Territory at-large |
| Idaho Territory at-large | Edward D. Holbrook | Democratic | 1864 | Incumbent re-elected. | ▌Y Edward D. Holbrook (Democratic) 55.45% ▌J. M. Kirkpatrick (Republican) 44.55% |
| Montana Territory at-large | Samuel McLean | Democratic | 1864 | Incumbent retired. Democratic hold. | ▌Y James M. Cavanaugh (Democratic) 54.95% ▌Wilbur F. Sanders (Republican) 45.05% |
| New Mexico Territory at-large |
| Utah Territory at-large |
| Washington Territory at-large |