W. B. Koch
- 1920 – Pennsylvania’s 16th congressional district (S) – lost
William Koch
- 1930 – New York’s 9th congressional district (R) – lost
Norman Kochendorfer
- 1934 – Missouri’s 13th congressional district (SL) – lost
- 1936 – Missouri’s 13th congressional district (SL) – lost
- 1938 – Missouri’s 13th congressional district (SL) – lost
- 1940 – Missouri’s 13th congressional district (SL) – lost
- 1946 – Missouri’s 13th congressional district (SL) – lost
Victor Kocher
- 2002 – United States Senate (South Carolina) (L) – lost
- 2014 – United States Senate (South Carolina) (L) – lost
- 2017 – South Carolina’s 5th congressional district (Special) (L) – lost
Leo Paul Kocialkowski
- 1932 – Illinois’ 8th congressional district (D) – won
- 1934 – Illinois’ 8th congressional district (D) – won
- 1936 – Illinois’ 8th congressional district (D) – won
- 1938 – Illinois’ 8th congressional district (D) – won
- 1940 – Illinois’ 8th congressional district (D) – won
John Kocinski
- 1924 – Ohio’s 9th congressional district (I) – lost
Nicholas W. Kodrovzeff
- 1984 – California’s 11th congressional district (AI) – lost
- 1988 – California’s 11th congressional district (I) – lost
Philip Koebel
- 2004 – California’s 29th congressional district (G) – lost
Gilbert E. Koedel
- 1944 – Pennsylvania’s 24th congressional district (R) – lost
Francis C. Koehler
- 1926 – New Jersey’s 6th congressional district (D) – lost
John C. Koehler
- 1994 – California’s 24th congressional district (L) – lost
Judy Koehler
- 1986 – United States Senate (Illinois) (R) – lost
Les Koehler
- 1978 – North Carolina’s 2nd congressional district (L) – lost
R. J. Koehler
- 1926 – Iowa’s 11th congressional district (D) – lost
Glenn Koenen
- 2012 – Missouri’s 2nd congressional district (D) – lost
Murray Koenig
- 1958 – New York’s 24th congressional district (Liberal) – lost
- 1960 – New York’s 24th congressional district (Liberal) – lost
Simon M. Koenig
- 1958 – New York’s 23rd congressional district (R) – lost
Samuel Koepnick
- 2012 – Nevada’s 2nd congressional district (D) – lost
Richard Koeppel
- 1922 – United States Senate (Wisconsin) (I, SL) – lost
- 1926 – United States Senate (Wisconsin) (I, SL) – lost
- 1928 – United States Senate (Wisconsin) (Ind. Labor) – lost
Robert Koeppicus
- 1938 – New York’s 1st congressional district (S) – lost
Henry Koetter
- 1920 – Pennsylvania’s 5th congressional district (Single Tax) – lost
Michael Bryant Koffenberger
- 2012 – Pennsylvania’s 4th congressional district (L) – lost
Raymond Peter Kogovsek
- 1978 – Colorado’s 3rd congressional district (D) – won
- 1980 – Colorado’s 3rd congressional district (D) – won
- 1982 – Colorado’s 3rd congressional district (D) – won
Dan Kohl
- 2018 – Wisconsin’s 6th congressional district (D) – lost
Herbert H. Kohl
- 1988 – United States Senate (Wisconsin) (D) – won
- 1994 – United States Senate (Wisconsin) (D) – won
- 2000 – United States Senate (Wisconsin) (D) – won
- 2006 – United States Senate (Wisconsin) (D) – won
Edward P. Kohlbacher
- 1964 – Illinois’ 18th congressional district (D) – lost
Fred Kohler
- 1936 – New York’s 41st congressional district (R) – lost
Walter W. Kohler
- 1944 – Pennsylvania’s 10th congressional district (R) – lost
Scott A. Kohlhaas
- 1998 – United States Senate (Alaska) (L) – lost
- 2004 – United States Senate (Alaska) (L) – lost
Cornelius Kohlmyer
- 1940 – Ohio’s 14th congressional district (I) – lost
Maggie Kohls
- 2002 – Illinois’ 4th congressional district (L) – lost
Marjorie Kohls
- 1998 – Illinois’ 1st congressional district (L) – lost
Jerry Kohn
- 2004 – United States Senate (Illinois) (L) – lost
Roger L. Kohn
- 1996 – North Carolina’s 12th congressional district (L) – lost
Gary L. Kohut
- 1986 – Michigan’s 18th congressional district (D) – lost
- 1988 – Michigan’s 18th congressional district (D) – lost
Jan Kok
- 2020 – Colorado’s 1st congressional district (Approval Voting) – lost
Arnold Kokans
- 1994 – New Jersey’s 4th congressional district (NL) – lost
- 1996 – New Jersey’s 4th congressional district (I) – lost
Peter Koker
- 1952 – Michigan’s 1st congressional district (I) – lost
Matt T. Kokkonen
- 2008 – California’s 23rd congressional district (R) – lost
Michael A. Kokoski
- 2014 – United States Senate (Hawaii) (Special) (L) – lost
- 2016 – United States Senate (Hawaii) (L) – lost
J. V. Kolachny
- 1922 – Oklahoma’s 6th congressional district (S) – lost
Charles C. Kolars
- 1926 – Minnesota’s 3rd congressional district (D) – lost
- 1928 – Minnesota’s 3rd congressional district (D) – lost
Carl V. Kolata
- 1964 – Wisconsin’s 2nd congressional district (R) – lost
LeAnne Kolb
- 2012 – Florida’s 5th congressional district (R) – lost
Harold H. Kolbe
- 1946 – Illinois’ 10th congressional district (D) – lost
James Thomas Kolbe
- 1982 – Arizona’s 5th congressional district (R) – lost
- 1984 – Arizona’s 5th congressional district (R) – won
- 1986 – Arizona’s 5th congressional district (R) – won
- 1988 – Arizona’s 5th congressional district (R) – won
- 1990 – Arizona’s 5th congressional district (R) – won
- 1992 – Arizona’s 5th congressional district (R) – won
- 1994 – Arizona’s 5th congressional district (R) – won
- 1996 – Arizona’s 5th congressional district (R) – won
- 1998 – Arizona’s 5th congressional district (R) – won
- 2000 – Arizona’s 5th congressional district (R) – won
- 2002 – Arizona’s 8th congressional district (R) – won
- 2004 – Arizona’s 8th congressional district (R) – won
Tom Kolbe
- 1992 – Colorado’s 6th congressional district (D) – lost
Vince Kolber
- 2014 – Illinois’ 5th congressional district (R) – lost
- 2016 – Illinois’ 5th congressional district (R) – lost
Leonard C. Koldin
- 1972 – New York’s 32nd congressional district (R, CON) – lost
Dorothy L. Kolis
- 1998 – Pennsylvania’s 14th congressional district (SW) – lost
