# List of new members of the 100th United States Congress

The 100th United States Congress began on January 3, 1987. There were 12 new senators (ten Democrats, two Republicans) and 50 new representatives (27 Democrats, 23 Republicans) at the start of the first session. Additionally, one senator (a Republican) and eight representatives (five Democrats, three Republicans) took office on various dates in order to fill vacancies during the 100th Congress before it ended on January 3, 1989.

## Senate
### Took office January 3, 1987

| State | Senator | Seniority | Switched party | Prior background | Birth year |
| Alabama | Richard Shelby (D) | 6th (94th overall) | Yes Defeated Jeremiah Denton (R) | U.S. House of Representatives Alabama Senate | 1934 |
| Arizona | John McCain (R) | 8th (96th overall) | No Open seat; replaced Barry Goldwater (R) | U.S. House of Representatives U.S. Navy Captain | 1936 |
| Colorado | Tim Wirth (D) | 3rd (91st overall) | No Open seat; replaced Gary Hart (D) | U.S. House of Representatives U.S. Army Reserve | 1939 |
| Florida | Bob Graham (D) | 10th (98th overall) | Yes Defeated Paula Hawkins (R) | Governor of Florida Florida Senate Florida House of Representatives | 1936 |
| Georgia | Wyche Fowler (D) | 5th (93rd overall) | Yes Defeated Mack Mattingly (R) | U.S. House of Representatives Atlanta City Council U.S. Army | 1940 |
| Louisiana | John Breaux (D) | 1st (89th overall) | No Open seat; replaced Russell B. Long (D) | U.S. House of Representatives | 1944 |
| Maryland | Barbara Mikulski (D) | 4th (92nd overall) | Yes Open seat; replaced Charles Mathias (R) | U.S. House of Representatives Baltimore City Council | 1936 |
| Missouri | Kit Bond (R) | 11th (99th overall) | Yes Open seat; replaced Thomas Eagleton (D) | Governor of Missouri State Auditor of Missouri | 1939 |
| Nevada | Harry Reid (D) | 9th (97th overall) | Yes Open seat; replaced Paul Laxalt (R) | U.S. House of Representatives Chair of the Nevada Gaming Commission Lieutenant Governor of Nevada Nevada Assembly | 1939 |
| North Dakota | Kent Conrad (D–NPL) | 12th (100th overall) | Yes Defeated Mark Andrews (R) | North Dakota Tax Commissioner | 1948 |
| South Dakota | Tom Daschle (D) | 7th (95th overall) | Yes Defeated James Abdnor (R) | U.S. House of Representatives U.S. Air Force | 1947 |
| Washington | Brock Adams (D) | 2nd (90th overall) | Yes Defeated Slade Gorton (R) | U.S. Secretary of Transportation U.S. House of Representatives U.S. Attorney for W.D. Wash. U.S. Navy | 1927 |

### Took office during the 100th Congress

| State | Image | Senator | Took office | Switched party | Prior background | Birth year | Ref |
| Nebraska | | David Karnes (R) | March 11, 1987 | Yes Appointed; replaced Edward Zorinsky (D) | Federal Home Loan Bank of Topeka | 1948 | |

## House of Representatives
### Took office January 3, 1987

| District | Representative | Switched party | Prior background | Birth year |
| Alabama 7 | Claude Harris Jr. (D) | No | State Circuit Judge | 1940 |
| Arizona 1 | John Jacob Rhodes III (R) | No | Lawyer | 1943 |
| Arizona 4 | Jon Kyl (R) | No | Attorney | 1942 |
| California 2 | Wally Herger (R) | No | State Assemblyman | 1945 |
| California 12 | Ernie Konnyu (R) | No | State Assemblyman | 1937 |
| California 21 | Elton Gallegly (R) | No | Mayor of Simi Valley | 1944 |
| Colorado 2 | David Skaggs (D) | No | State Representative | 1943 |
| Colorado 3 | Ben Nighthorse Campbell (D) | Yes | State Representative | 1933 |
| Colorado 5 | Joel Hefley (R) | No | State Senator | 1935 |
| Florida 2 | James W. Grant (D) | No | State Senator | 1943 |
| Georgia 5 | John Lewis (D) | No | City Councilor | 1940 |
| Hawaii 1 | Pat Saiki (R) | Yes | State Senator | 1930 |
| Illinois 4 | Jack Davis (R) | No | State Representative | 1935 |
| Illinois 14 | Dennis Hastert (R) | No | State Representative | 1942 |
| Indiana 5 | Jim Jontz (D) | Yes | State Senator | 1951 |
| Iowa 3 | David R. Nagle (D) | Yes | State Party Chair | 1943 |
| Iowa 6 | Fred Grandy (R) | Yes | Actor | 1948 |
| Kentucky 4 | Jim Bunning (R) | No | State Senator | 1931 |
| Louisiana 6 | Richard Baker (R) | No | State Representative | 1948 |
| Louisiana 7 | Jimmy Hayes (D) | No | Lawyer | 1946 |
| Louisiana 8 | Clyde C. Holloway (R) | Yes | Businessman | 1943 |
| Maine 1 | Joseph E. Brennan (D) | Yes | Governor of Maine | 1934 |
| Maryland 3 | Ben Cardin (D) | No | State House Speaker | 1943 |
| Maryland 4 | Tom McMillen (D) | Yes | Professional basketball player | 1952 |
| Maryland 7 | Kweisi Mfume (D) | No | City Councilor | 1948 |
| Maryland 8 | Connie Morella (R) | Yes | State Delegate | 1931 |
| Massachusetts 8 | Joseph P. Kennedy II (D) | No | President of Citizens Energy Corporation | 1952 |
| Michigan 4 | Fred Upton (R) | No | Congressional staffer | 1953 |
| Mississippi 2 | Mike Espy (D) | Yes | Attorney | 1953 |
| Missouri 2 | Jack Buechner (R) | Yes | State Representative | 1940 |
| Nevada 1 | James Bilbray (D) | No | State Senator | 1938 |
| New York 1 | George J. Hochbrueckner (D) | Yes | State Assemblyman | 1938 |
| New York 6 | Floyd Flake (D) | No | Pastor | 1945 |
| New York 30 | Louise Slaughter (D) | Yes | State Assemblywoman | 1929 |
| New York 34 | Amo Houghton (R) | Yes | Business executive | 1926 |
| North Carolina 3 | Martin Lancaster (D) | No | State Representative | 1943 |
| North Carolina 4 | David Price (D) | Yes | Professor | 1940 |
| North Carolina 10 | Cass Ballenger (R) | No | State Senator | 1926 |
| North Carolina 11 | James M. Clarke (D) | Yes | U.S. Representative | 1917 |
| Ohio 8 | Donald "Buz" Lukens (R) | No | State Senator | 1931 |
| Ohio 14 | Tom Sawyer (D) | No | Mayor of Akron | 1945 |
| Oklahoma 1 | Jim Inhofe (R) | Yes | Mayor of Tulsa | 1934 |
| Oregon 4 | Peter DeFazio (D) | No | County Commissioner | 1947 |
| Pennsylvania 7 | Curt Weldon (R) | Yes | County Councilor | 1947 |
| South Carolina 1 | Arthur Ravenel Jr. (R) | No | State Senator | 1927 |
| South Carolina 4 | Liz J. Patterson (D) | Yes | State Senator | 1939 |
| South Dakota at-large | Tim Johnson (D) | No | State Senator | 1946 |
| Texas 21 | Lamar Smith (R) | No | County Commissioner | 1947 |
| Utah 2 | Wayne Owens (D) | Yes | U.S. Representative | 1937 |
| Virginia 2 | Owen B. Pickett (D) | Yes | State Delegate | 1930 |

### Took office during the 100th Congress

| District | Representative | Took office | Switched party | Prior background | Birth year |
| California 5 | Nancy Pelosi (D) | June 2, 1987 | No | State Party Chair | 1940 |
| Connecticut 4 | Chris Shays (R) | August 18, 1987 | No | State Representative | 1945 |
| Tennessee 5 | Bob Clement (D) | January 19, 1988 | No | President of Cumberland University | 1943 |
| Louisiana 4 | Jim McCrery (R) | April 16, 1988 | Yes | Congressional staffer | 1949 |
| Virginia 5 | Lewis F. Payne Jr. (D) | June 14, 1988 | No | Business executive | 1945 |
| Illinois 21 | Jerry Costello (D) | August 9, 1988 | No | County Board Member | 1949 |
| New Jersey 3 | Frank Pallone (D) | November 8, 1988 | No | State Senator | 1951 |
| Tennessee 2 | Jimmy Duncan (R) | November 8, 1988 | No | County Court Judge | 1947 |