John Ashmead
- 1952 – Connecticut’s 1st congressional district (R) – lost
Robert Thomas Ashmore
- 1954 – South Carolina’s 4th congressional district (D) – won
- 1956 – South Carolina’s 4th congressional district (D) – won
- 1958 – South Carolina’s 4th congressional district (D) – won
- 1960 – South Carolina’s 4th congressional district (D) – won
- 1962 – South Carolina’s 4th congressional district (D) – won
- 1964 – South Carolina’s 4th congressional district (D) – won
- 1966 – South Carolina’s 4th congressional district (D) – won
Augustus Trask Ashton
- 1940 – Pennsylvania’s 2nd congressional district (R) – lost
- 1942 – Pennsylvania’s 2nd congressional district (R) – lost
Henry Fountain Ashurst
- 1922 – United States Senate (Arizona) (D) – won
- 1928 – United States Senate (Arizona) (D) – won
- 1934 – United States Senate (Arizona) (D) – won
David G. Ashworth
- 1978 – Georgia’s 9th congressional district (R) – lost
- 1980 – Georgia’s 9th congressional district (R) – lost
Eugene B. Ashworth
- 1996 – New Jersey’s 3rd congressional district (I) – lost
Peter J. Ashy
- 1996 – United States Senate (South Carolina) (Ref.) – lost
- 1998 – South Carolina’s 4th congressional district (Patriot, Reform) – lost
- 2000 – South Carolina’s 4th congressional district (United Citizens, Reform) – lost
- 2002 – South Carolina’s 4th congressional district (D) – lost
Andrew Asikainen
- 1942 – Michigan’s 12th congressional district (Proh.) – lost
Sue Askeland
- 2010 – United States Senate (Florida) (I) – lost
Frank Askin
- 1986 – New Jersey’s 11th congressional district (D) – lost
David L. Askren
- 1992 – New York’s 8th congressional district (R) – lost
- 1994 – New York’s 8th congressional district (R) – lost
Ken Asmus
- 1998 – Michigan’s 6th congressional district (NL) – lost
Leslie Aspin, Jr.
- 1970 – Wisconsin’s 1st congressional district (D) – won
- 1972 – Wisconsin’s 1st congressional district (D) – won
- 1974 – Wisconsin’s 1st congressional district (D) – won
- 1976 – Wisconsin’s 1st congressional district (D) – won
- 1978 – Wisconsin’s 1st congressional district (D) – won
- 1980 – Wisconsin’s 1st congressional district (D) – won
- 1982 – Wisconsin’s 1st congressional district (D) – won
- 1984 – Wisconsin’s 1st congressional district (D) – won
- 1986 – Wisconsin’s 1st congressional district (D) – won
- 1988 – Wisconsin’s 1st congressional district (D) – won
- 1990 – Wisconsin’s 1st congressional district (D) – won
- 1992 – Wisconsin’s 1st congressional district (D) – won
Wayne Norviel Aspinall
- 1948 – Colorado’s 4th congressional district (D) – won
- 1950 – Colorado’s 4th congressional district (D) – won
- 1952 – Colorado’s 4th congressional district (D) – won
- 1954 – Colorado’s 4th congressional district (D) – won
- 1956 – Colorado’s 4th congressional district (D) – won
- 1958 – Colorado’s 4th congressional district (D) – won
- 1960 – Colorado’s 4th congressional district (D) – won
- 1962 – Colorado’s 4th congressional district (D) – won
- 1964 – Colorado’s 4th congressional district (D) – won
- 1966 – Colorado’s 4th congressional district (D) – won
- 1968 – Colorado’s 4th congressional district (D) – won
- 1970 – Colorado’s 4th congressional district (D) – won
Francis H. Aspinwall
- 1968 – New York’s 34th congressional district (CON) – lost
- 1974 – New York’s 33rd congressional district (CON) – lost
Charles T. Asque
- 1952 – New York’s 42nd congressional district (American Labor) – lost
Edmund D. Assante
- 1976 – New York’s 24th congressional district (Liberal) – lost
Charles B. Asselin
- 1938 – Michigan’s 10th congressional district (Const. Dem.) – lost
Mark W. Assini
- 2004 – New York’s 29th congressional district (CON) – lost
- 2014 – New York’s 25th congressional district (R, CON) – lost
- 2016 – New York’s 25th congressional district (R, CON, IND, Ref.) – lost
Craig R. Astor
- 2012 – Kentucky’s 2nd congressional district (L) – lost
James J. Astoria
- 1920 – New York’s 4th congressional district (R) – lost
Irving Astrow
- 1958 – New York’s 28th congressional district (Liberal) – lost
James Benjamin Aswell, Sr.
- 1920 – Louisiana’s 8th congressional district (D) – won
- 1922 – Louisiana’s 8th congressional district (D) – won
- 1924 – Louisiana’s 8th congressional district (D) – won
- 1926 – Louisiana’s 8th congressional district (D) – won
- 1928 – Louisiana’s 8th congressional district (D) – won
- 1930 – Louisiana’s 8th congressional district (D) – won
Paul M. Atanasi
- 1980 – New York’s 15th congressional district (R, CON, RTL) – lost
Susanne Atanus
- 2008 – Illinois’ 9th congressional district (W/I) – lost
- 2010 – United States Senate (Illinois) (W/I) – lost
- 2012 – Illinois’ 9th congressional district (W/I) – lost
- 2014 – Illinois’ 9th congressional district (R) – lost
- 2016 – Illinois’ 9th congressional district (W/I) – lost
Forrest S. Atchley
- 1956 – New Mexico’s at large congressional district (R) – lost
- 1958 – United States Senate (New Mexico) (R) – lost
Byron D. Athan
- 1970 – California’s 14th congressional district (R) – lost
George Athanasopoulos
- 2016 – Colorado’s 7th congressional district (R) – lost
Ted Athey
- 2016 – Maryland’s 6th congressional district (W/I) – lost
Peter Atigan
- 1980 – Pennsylvania’s 23rd congressional district (D) – lost
William Oscar Atkeson
- 1920 – Missouri’s 6th congressional district (R) – won
- 1922 – Missouri’s 6th congressional district (R) – lost
- 1924 – Missouri’s 6th congressional district (R) – lost
Ben Atkins
- 1934 – Ohio’s at large congressional district (Comm.) – lost
Chester Greenough Atkins
- 1984 – Massachusetts’ 5th congressional district (D) – won
- 1986 – Massachusetts’ 5th congressional district (D) – won
- 1988 – Massachusetts’ 5th congressional district (D) – won
- 1990 – Massachusetts’ 5th congressional district (D) – won
George T. Atkins
- 1970 – Pennsylvania’s 6th congressional district (C) – lost
Hobart F. Atkins
- 1952 – United States Senate (Tennessee) (R) – lost
- 1958 – United States Senate (Tennessee) (R) – lost
Roland J. Atkins
- 1978 – Pennsylvania’s 2nd congressional district (R) – lost
Tom (Thearon) Atkins
- 1980 – Ohio’s 2nd congressional district (R) – lost
C. T. Atkinson
- 1938 – United States Senate (Arkansas) (R) – lost
Eugene Vincent Atkinson
- 1976 – Pennsylvania’s 25th congressional district (D) – lost
- 1978 – Pennsylvania’s 25th congressional district (D) – won
- 1980 – Pennsylvania’s 25th congressional district (D) – won
- 1982 – Pennsylvania’s 4th congressional district (R) – lost
George S. Atkinson
- 1924 – Texas’ 5th congressional district (R) – lost
H. S. Atkinson
- 1926 – Ohio’s 12th congressional district (D) – lost
Luke Atkinson
- 1970 – North Carolina’s 11th congressional district (R) – lost
Richardson Merrill Atkinson
- 1936 – Tennessee’s 5th congressional district (D) – won
Sue Atkinson
- 1992 – United States Senate (Iowa) (Nominated by Petition) – lost
- 1996 – United States Senate (Iowa) (Nomination by Petition) – lost
- 2000 – Iowa’s 3rd congressional district (IND) – lost
Thom Atkinson
- 2020 – Colorado’s 2nd congressional district (L) – lost
Eric Atkisson
- 1998 – Texas’ 25th congressional district (L) – lost
Robert Atlas
- 1972 – New York’s 2nd congressional district (Liberal) – lost
A. T. Atwater
- 1924 – Georgia’s 7th congressional district (I) – lost
A. Bruce Atwell
- 1928 – Michigan’s 6th congressional district (D) – lost
Arthur H. Atwood
- 1924 – South Dakota’s 3rd congressional district (I) – lost
