District Image Representative Switched party Prior background Birth year Ref Arizona 1 Ann Kirkpatrick (D) New seat U.S. House of Representatives [ h] Arizona House of Representatives 1950 [ 19] Arizona 5 Matt Salmon (R) No Open seat; replaced Jeff Flake (R) U.S. House of Representatives [ i] Chair of the Arizona Republican Party Arizona Senate 1958 [ 20] Arizona 9 Kyrsten Sinema (D) New seat Arizona Senate Arizona House of Representatives 1976 [ 21] Arkansas 4 Tom Cotton (R) Yes Open seat; replaced Mike Ross (D) Lawyer U.S. Army Captain 1977 [ 22] California 1 Doug LaMalfa (R) No Open seat; replaced Wally Herger (R) California State Senate California State Assembly 1960 [ 23] California 2 Jared Huffman (D) No Open seat; replaced Lynn Woolsey (D) California State Assembly Marin Municipal Water District 1964 [ 24] California 7 Ami Bera (D) Yes Defeated Dan Lungren (R) CMO for Sacramento County Physician 1965 [ 25] California 8 Paul Cook (R) No Open seat; replaced Jerry Lewis (R) California State Assembly Yucca Valley Town Council U.S. Marine Corps Colonel 1943 [ 26] California 15 Eric Swalwell (D) No Defeated Pete Stark (D) Dublin City Council Alameda County deputy district attorney 1980 [ 27] California 21 David Valadao (R) New seat California State Assembly 1977 [ 28] California 26 Julia Brownley (D) Yes Open seat; replaced Elton Gallegly (R) California State Assembly Santa Monica–Malibu School Board 1952 [ 29] California 29 Tony Cárdenas (D) New seat Los Angeles City Council California State Assembly 1963 [ 30] California 35 Gloria Negrete McLeod (D) No Defeated Joe Baca (D) California State Senate California State Assembly Chaffey College Board 1941 [ 31] California 36 Raul Ruiz (D) Yes Defeated Mary Bono (R) Physician 1971 [ 32] California 41 Mark Takano (D) New seat Riverside Community College District Board 1960 [ 33] California 47 Alan Lowenthal (D) New seat California State Senate California State Assembly Long Beach City Council 1941 [ 34] California 51 Juan Vargas (D) No Open seat; replaced Bob Filner (D) California State Senate California State Assembly San Diego City Council 1961 [ 35] California 52 Scott Peters (D) Yes Defeated Brian Bilbray (R) President of the San Diego City Council San Diego County deputy attorney 1958 [ 36] Connecticut 5 Elizabeth Esty (D) No Open seat; replaced Chris Murphy (D) Connecticut House of Representatives Cheshire Town Council 1959 [ 37] Florida 3 Ted Yoho (R) No Defeated Cliff Stearns (R) in a primary Veterinarian 1955 [ 38] Florida 6 Ron DeSantis (R) New seat U.S. Navy Judge Advocate General's Corps 1978 [ 39] Florida 9 Alan Grayson (D) New seat U.S. House of Representatives [ j] 1958 [ 40] Florida 18 Patrick Murphy (D) Yes Defeated Allen West (R) Construction executive 1983 [ 41] Florida 19 Trey Radel (R) No Open seat; replaced Connie Mack IV (R) Radio talk show host 1976 [ 42] Florida 22 Lois Frankel (D) New seat Mayor of West Palm Beach Florida House of Representatives 1948 [ 43] Florida 26 Joe Garcia (D) Yes Defeated David Rivera (R) U.S. Department of Energy official Chair of the Florida Public Service Commission 1963 [ 44] Georgia 9 Doug Collins (R) New seat Georgia House of Representatives U.S. Air Force Reserve Colonel 1966 [ 45] Hawaii 2 Tulsi Gabbard (D) No Open seat; replaced Mazie Hirono (D) Honolulu City Council Hawaii House of Representatives U.S. Army Reserve Lieutenant Colonel 1981 [ 46] Illinois 8 Tammy Duckworth (D) Yes Defeated Joe Walsh (R) Assistant Secretary of Veterans Affairs Illinois Director of Veterans' Affairs U.S. Army Lieutenant Colonel 1968 [ 47] Illinois 10 Brad Schneider (D) Yes Defeated Bob Dold (R) Businessman 1961 [ 48] Illinois 11 Bill Foster (D) Yes Defeated Judy Biggert (R) U.S. House of Representatives [ k] Physicist 1955 [ 49] Illinois 12 William Enyart (D) No Open seat; replaced Jerry Costello (R) Adjutant General of Illinois U.S. Air Force Major General 1949 [ 50] Illinois 13 Rodney Davis (R) No Open seat; replaced Tim Johnson (R) Staffer for U.S. Representative John Shimkus Staffer for Secretary of State George Ryan 1970 [ 51] Illinois 17 Cheri Bustos (D) Yes Defeated Bobby Schilling (R) East Moline City Council Healthcare executive 1961 [ 52] Indiana 2 Jackie Walorski (R) Yes Open seat; replaced Joe Donnelly (D) Indiana House of Representatives 1963 [ 53] Indiana 5 Susan Brooks (R) No Open seat; replaced Dan Burton (R) U.S. Attorney for Southern Indiana 1960 [ 54] Indiana 6 Luke Messer (R) No Open seat; replaced Mike Pence (R) Indiana House of Representatives 1969 [ 55] Kentucky 6 Andy Barr (R) Yes Defeated Ben Chandler (D) Lawyer 1973 [ 56] Maryland 6 John Delaney (D) Yes Defeated Roscoe Bartlett (R) Business owner 1963 [ 57] Massachusetts 4 Joe Kennedy III (D) No Open seat; replaced Barney Frank (D) Middlesex County assistant district attorney 1980 [ 58] Michigan 5 Dan Kildee (D) No Open seat; replaced Dale Kildee (D) Genesee County Treasurer Genesee County Board of Commissioners 1958 [ 59] Michigan 11 Kerry Bentivolio (R) No Open seat; replaced Thaddeus McCotter (R) Educator Michigan National Guard Sergeant First Class 1951 [ 60] Minnesota 8 Rick Nolan (DFL) Yes Defeated Chip Cravaack (R) President of the Minnesota World Trade Center U.S. House of Representatives [ l] Minnesota House of Representatives 1943 [ 61] Missouri 2 Ann Wagner (R) No Open seat; replaced Todd Akin (R) U.S. Ambassador to Luxembourg Co-chair of the Republican National Committee Chair of the Missouri Republican Party 1962 [ 62] Montana at-large Steve Daines (R) No Open seat; replaced Denny Rehberg (R) Businessman 1962 [ 63] Nevada 1 Dina Titus (D) No Open seat; replaced Shelley Berkley (D) U.S. House of Representatives [ m] Nevada Senate Political science professor 1950 [ 64] Nevada 4 Steven Horsford (D) New seat Nevada Senate 1973 [ 65] New Hampshire 1 Carol Shea-Porter (D) Yes Defeated Frank Guinta (R) U.S. House of Representatives [ n] 1952 [ 66] New Hampshire 2 Annie Kuster (D) Yes Defeated Charles Bass (R) Attorney 1956 [ 67] New Mexico 1 Michelle Lujan Grisham (D) No Open seat; replaced Martin Heinrich (D) New Mexico Secretary of Health New Mexico Secretary of Aging 1959 [ 68] New York 6 Grace Meng (D) No Open seat; replaced Gary Ackerman (D) New York State Assembly 1975 [ 69] New York 8 Hakeem Jeffries (D) No Open seat; replaced Edolphus Towns (D) New York State Assembly 1970 [ 70] New York 18 Sean Patrick Maloney (D) Yes Defeated Nan Hayworth (R) White House Staff Secretary COO of Klodex 1966 [ 71] New York 24 Dan Maffei (D) Yes Defeated Ann Marie Buerkle (R) U.S. House of Representatives [ o] Congressional staffer 1968 [ 72] New York 27 Chris Collins (R) Yes Defeated Kathy Hochul (D) Erie County Executive 1950 [ 73] North Carolina 8 Richard Hudson (R) Yes Defeated Larry Kissell (D) Congressional staffer 1971 [ 74] North Carolina 9 Robert Pittenger (R) No Open seat; replaced Sue Myrick (R) North Carolina Senate 1948 [ 75] North Carolina 11 Mark Meadows (R) Yes Open seat; replaced Heath Shuler (D) Real estate developer 1959 [ 76] North Carolina 13 George Holding (R) Yes Open seat; replaced Brad Miller (D) U.S. Attorney for Eastern North Carolina Assistant U.S. Attorney 1968 [ 77] North Dakota at-large Kevin Cramer (R) No Open seat; replaced Rick Berg (R) North Dakota Public Service Commission Chair of the North Dakota Republican Party 1961 [ 78] Ohio 2 Brad Wenstrup (R) No Defeated Jean Schmidt (R) in a primary Podiatric physician U.S. Army Reserve Colonel 1958 [ 79] Ohio 3 Joyce Beatty (D) New seat Senior vice president of Ohio State University Ohio House of Representatives 1950 [ 80] Ohio 14 David Joyce (R) No Open seat; replaced Steve LaTourette (R) Geauga County Prosecutor 1957 [ 81] Oklahoma 1 Jim Bridenstine (R) No Defeated John Sullivan (R) in a primary U.S. Navy Lieutenant Commander 1975 [ 82] Oklahoma 2 Markwayne Mullin (R) Yes Open seat; replaced Dan Boren (D) Plumbing business owner Mixed martial artist 1977 [ 83] Pennsylvania 4 Scott Perry (R) No Open seat; replaced Todd Platts (R) Pennsylvania House of Representatives Pennsylvania National Guard Brigadier General 1962 [ 84] Pennsylvania 12 Keith Rothfus (R) Yes Defeated Mark Critz (D) Director of the OFBCI U.S. Department of Homeland Security official 1962 [ 85] Pennsylvania 17 Matt Cartwright (D) No Defeated Tim Holden (D) in a primary Lawyer 1961 [ 86] South Carolina 7 Tom Rice (R) New seat Horry County Council 1957 [ 87] Texas 14 Randy Weber (R) No Open seat; replaced Ron Paul (R) Texas House of Representatives Pearland City Council 1953 [ 88] Texas 16 Beto O'Rourke (D) No Defeated Silvestre Reyes (D) in a primary El Paso City Council 1972 [ 89] Texas 20 Joaquin Castro (D) No Open seat; replaced Charlie Gonzalez (D) Texas House of Representatives 1974 [ 90] Texas 23 Pete Gallego (D) Yes Defeated Quico Canseco (R) Texas House of Representatives 1961 [ 91] Texas 25 Roger Williams (R) New seat Secretary of State of Texas Car dealership owner College baseball coach 1949 [ 92] Texas 33 Marc Veasey (D) New seat Texas House of Representatives 1971 [ 93] Texas 34 Filemon Vela Jr. (D) New seat Civil attorney 1963 [ 94] Texas 36 Steve Stockman (R) New seat U.S. House of Representatives [ p] 1956 [ 95] Utah 2 Chris Stewart (R) New seat Business executive U.S. Air Force Major 1960 [ 96] Washington 6 Derek Kilmer (D) No Open seat; replaced Norm Dicks (D) Washington State Senate Washington House of Representatives 1974 [ 97] Washington 10 Denny Heck (D) New seat Washington House of Representatives 1952 [ 98] Wisconsin 2 Mark Pocan (D) No Open seat; replaced Tammy Baldwin (D) Wisconsin State Assembly Dane County Board of Supervisors 1964 [ 99]