Joseph C. Mansfield
- 1954 – Pennsylvania’s 13th congressional district (D) – lost
Joseph Jefferson Mansfield
- 1920 – Texas’ 9th congressional district (D) – won
- 1922 – Texas’ 9th congressional district (D) – won
- 1924 – Texas’ 9th congressional district (D) – won
- 1926 – Texas’ 9th congressional district (D) – won
- 1928 – Texas’ 9th congressional district (D) – won
- 1930 – Texas’ 9th congressional district (D) – won
- 1932 – Texas’ 9th congressional district (D) – won
- 1934 – Texas’ 9th congressional district (D) – won
- 1936 – Texas’ 9th congressional district (D) – won
- 1938 – Texas’ 9th congressional district (D) – won
- 1940 – Texas’ 9th congressional district (D) – won
- 1942 – Texas’ 9th congressional district (D) – won
- 1944 – Texas’ 9th congressional district (D) – won
- 1946 – Texas’ 9th congressional district (D) – won
Michael Joseph Mansfield
- 1942 – Montana’s 1st congressional district (D) – won
- 1944 – Montana’s 1st congressional district (D) – won
- 1946 – Montana’s 1st congressional district (D) – won
- 1948 – Montana’s 1st congressional district (D) – won
- 1950 – Montana’s 1st congressional district (D) – won
- 1952 – United States Senate (Montana) (D) – won
- 1958 – United States Senate (Montana) (D) – won
- 1964 – United States Senate (Montana) (D) – won
- 1970 – United States Senate (Montana) (D) – won
Robert Allen Mansfield, Jr.
- 2012 – Pennsylvania’s 2nd congressional district (R) – lost
Salvatore T. Mansi
- 1970 – New Jersey’s 1st congressional district (D) – lost
James A. Manson
- 1928 – New York’s 32nd congressional district (S) – lost
- 1930 – New York’s 32nd congressional district (S) – lost
- 1932 – New York’s 32nd congressional district (S) – lost
Don Manspeaker
- 2012 – United States Senate (Arizona) (I-W/I) – lost
Fred M. Mansur
- 1924 – Connecticut’s 1st congressional district (S) – lost
- 1926 – Connecticut’s 1st congressional district (S) – lost
- 1928 – Connecticut’s 1st congressional district (S) – lost
- 1932 – Connecticut’s 1st congressional district (S) – lost
Alfred A. Manti
- 1954 – New York’s 14th congressional district (R) – lost
James H. Mantis
- 1960 – Pennsylvania’s 14th congressional district (R) – lost
Thomas J. Manton
- 1984 – New York’s 9th congressional district (D) – won
- 1986 – New York’s 9th congressional district (D) – won
- 1988 – New York’s 9th congressional district (D) – won
- 1990 – New York’s 9th congressional district (D) – won
- 1992 – New York’s 7th congressional district (D) – won
- 1994 – New York’s 7th congressional district (D) – won
- 1996 – New York’s 7th congressional district (D) – won
Donald W. Mantooth
- 2006 – Indiana’s 9th congressional district (R-W/I) – lost
Andrew Mantovani
- 1968 – New York’s 24th congressional district (R) – lost
Lawrence R. Manuel
- 1986 – California’s 8th congressional district (PF) – lost
Albert H. Manus, Jr.
- 1948 – Illinois’ 16th congressional district (D) – lost
Michael Noel Manypenny II
- 2016 – West Virginia’s 1st congressional district (D) – lost
Donald A. Manzullo
- 1992 – Illinois’ 16th congressional district (R) – won
- 1994 – Illinois’ 16th congressional district (R) – won
- 1996 – Illinois’ 16th congressional district (R) – won
- 1998 – Illinois’ 16th congressional district (R) – won
- 2000 – Illinois’ 16th congressional district (R) – won
- 2002 – Illinois’ 16th congressional district (R) – won
- 2004 – Illinois’ 16th congressional district (R) – won
- 2006 – Illinois’ 16th congressional district (R) – won
- 2008 – Illinois’ 16th congressional district (R) – won
- 2010 – Illinois’ 16th congressional district (R) – won
Carl Edgar Mapes
- 1920 – Michigan’s 5th congressional district (R) – won
- 1922 – Michigan’s 5th congressional district (R) – won
- 1924 – Michigan’s 5th congressional district (R) – won
- 1926 – Michigan’s 5th congressional district (R) – won
- 1928 – Michigan’s 5th congressional district (R) – won
- 1930 – Michigan’s 5th congressional district (R) – won
- 1932 – Michigan’s 5th congressional district (R) – won
- 1934 – Michigan’s 5th congressional district (R) – won
- 1936 – Michigan’s 5th congressional district (R) – won
- 1938 – Michigan’s 5th congressional district (R) – won
Gavin Maple
- 2022 – Indiana’s 7th congressional district (L) – lost
Albert Maples
- 1956 – Georgia’s 2nd congressional district (I) – lost
John A. Mapp
- 1980 – Virginia’s 3rd congressional district (D) – lost
Emma Wong Mar
- 1994 – California’s 9th congressional district (PF) – lost
Ross Maracchion
- 1950 – New York’s 35th congressional district (American Labor) – lost
Luigi R. Marano
- 1964 – New York’s 15th congressional district (R, CON) – lost
Gaetano T. Maratea
- 1956 – Massachusetts’ 1st congressional district (Proh.) – lost
Joseph James Maraziti
- 1972 – New Jersey’s 13th congressional district (R) – won
- 1974 – New Jersey’s 13th congressional district (R) – lost
Lloyd K. Marbet
- 1980 – Oregon’s 2nd congressional district (I) – lost
Samuel D. Marble
- 1974 – Michigan’s 10th congressional district (D) – lost
Vito Anthony Marcantonio
- 1934 – New York’s 20th congressional district (R) – won
- 1936 – New York’s 20th congressional district (R, Comm.) – lost
- 1938 – New York’s 20th congressional district (American Labor, R) – won
- 1940 – New York’s 20th congressional district (American Labor, R) – won
- 1942 – New York’s 20th congressional district (American Labor, D, R) – won
- 1944 – New York’s 18th congressional district (American Labor, R, D) – won
- 1946 – New York’s 18th congressional district (American Labor, D) – won
- 1948 – New York’s 18th congressional district (American Labor) – won
- 1950 – New York’s 18th congressional district (American Labor) – lost
Basil J. Marceaux
- 2002 – United States Senate (Tennessee) (I) – lost
David D. March
- 2010 – United States Senate (Alaska) (W/I) – lost
Deanna M. March
- 2010 – United States Senate (Alaska) (W/I) – lost
Ralph C. March
- 1946 – Michigan’s 4th congressional district (Proh.) – lost
- 1948 – Michigan’s 4th congressional district (Proh.) – lost
- 1950 – Michigan’s 4th congressional district (Proh.) – lost
- 1952 – Michigan’s 4th congressional district (Proh.) – lost
Jim Marchant
- 2020 – Nevada’s 4th congressional district (R) – lost
Kenny Ewell Marchant
- 2004 – Texas’ 24th congressional district (R) – won
- 2006 – Texas’ 24th congressional district (R) – won
- 2008 – Texas’ 24th congressional district (R) – won
- 2010 – Texas’ 24th congressional district (R) – won
- 2012 – Texas’ 24th congressional district (R) – won
- 2014 – Texas’ 24th congressional district (R) – won
- 2016 – Texas’ 24th congressional district (R) – won
- 2018 – Texas’ 24th congressional district (R) – won
Neal Marchbanks
- 2014 – Texas’ 19th congressional district (D) – lost
Peter M. Marchetti
- 2012 – Virginia’s 11th congressional district (IG) – lost
Kathleen Marciano
- 1996 – New York’s 13th congressional district (RTL) – lost
Jim Marcinkowski
- 2006 – Michigan’s 8th congressional district (D) – lost
Joseph F. Marcucci
- 1972 – New York’s 13th congressional district (R) – lost
Lyn Marcum
- 2010 – United States Senate (Alaska) (W/I) – lost
Ted R. Marcum
- 1980 – Kentucky’s 5th congressional district (D) – lost
Jay B. Marcus
- 1996 – Iowa’s 3rd congressional district (NL) – lost
- 2000 – Iowa’s 3rd congressional district (R) – lost
Jeremy Marcus
- 2016 – New Jersey’s 4th congressional district (L) – lost
- 2022 – New Jersey’s 5th congressional district (L) – lost
Susan Marcus
- 1998 – United States Senate (Iowa) (NL) – lost
Bill Marcy
- 2010 – Mississippi’s 2nd congressional district (R) – lost
- 2012 – Mississippi’s 2nd congressional district (R) – lost
Wes Marden
- 1974 – California’s 42nd congressional district (R) – lost
- 1976 – California’s 42nd congressional district (R) – lost
William C. Mardis
- 1922 – Illinois’ 14th congressional district (FL) – lost
Marjorie Margolies-Mezvinsky
- 1992 – Pennsylvania’s 13th congressional district (D) – won
- 1994 – Pennsylvania’s 13th congressional district (D) – lost
George Henry Margolis
- 1982 – California’s 21st congressional district (D) – lost
