Hector Cortes, Jr.
- 1998 – New York’s 12th congressional district (Liberal) – lost
Frank V. Cortese
- 1972 – California’s 7th congressional district (American) – lost
Patricia A. Cortez
- 1976 – Ohio’s 13th congressional district (I) – lost
Catherine Marie Cortez Masto
- 2016 – United States Senate (Nevada) (D) – won
- 2022 – United States Senate (Nevada) (D) – won
Don Cortum
- 1966 – California’s 17th congressional district (R) – lost
Ruben S. Corvalan
- 2014 – Texas’ 23rd congressional district (L) – lost
- 2016 – Texas’ 23rd congressional district (L) – lost
- 2018 – Texas’ 23rd congressional district (L) – lost
Jaime A. Corvera
- 2002 – California’s 22nd congressional district (D) – lost
Jim Corwin
- 2006 – Maryland’s 1st congressional district (D) – lost
David M. Cory
- 1932 – New York’s 7th congressional district (S) – lost
- 1934 – New York’s 4th congressional district (S) – lost
- 1936 – New York’s 4th congressional district (S) – lost
- 1938 – New York’s 4th congressional district (S) – lost
Jon Stevens Corzine
- 2000 – United States Senate (New Jersey) (D) – won
Joseph L. Cosetti
- 1968 – Pennsylvania’s 27th congressional district (D) – lost
James Cosgrove
- 1930 – Vermont’s 2nd congressional district (D) – lost
Thomas A. Cosgrove
- 1980 – California’s 32nd congressional district (L) – lost
David L. Cossak
- 1998 – California’s 26th congressional district (NL) – lost
- 2000 – California’s 26th congressional district (NL) – lost
John C. Cosseboom
- 1934 – Rhode Island’s 1st congressional district (R) – lost
Robert G. Cossette
- 1976 – Connecticut’s 3rd congressional district (George Wallace) – lost
Catherine A. Costa
- 1976 – New Jersey’s 6th congressional district (D) – lost
James Manuel Costa
- 2004 – California’s 20th congressional district (D) – won
- 2006 – California’s 20th congressional district (D) – won
- 2008 – California’s 20th congressional district (D) – won
- 2010 – California’s 20th congressional district (D) – won
- 2012 – California’s 16th congressional district (D) – won
- 2014 – California’s 16th congressional district (D) – won
- 2016 – California’s 16th congressional district (D) – won
- 2018 – California’s 16th congressional district (D) – won
- 2020 – California’s 16th congressional district (D) – won
- 2022 – California’s 21st congressional district (D) – won
Leo Antonio Costa
- 1966 – California’s 14th congressional district (Special) (D) – lost
Margaret Costanza
- 1974 – New York’s 35th congressional district (D) – lost
William Bill Costas
- 1978 – Indiana’s 2nd congressional district (I) – lost
- 1986 – Indiana’s 1st congressional district (R) – lost
- 1990 – Indiana’s 1st congressional district (R) – lost
Jerry Francis Costello
- 1988 – Illinois’ 21st congressional district (D) – won
- 1990 – Illinois’ 21st congressional district (D) – won
- 1992 – Illinois’ 12th congressional district (D) – won
- 1994 – Illinois’ 12th congressional district (D) – won
- 1996 – Illinois’ 12th congressional district (D) – won
- 1998 – Illinois’ 12th congressional district (D) – won
- 2000 – Illinois’ 12th congressional district (D) – won
- 2002 – Illinois’ 12th congressional district (D) – won
- 2004 – Illinois’ 12th congressional district (D) – won
- 2006 – Illinois’ 12th congressional district (D) – won
- 2008 – Illinois’ 12th congressional district (D) – won
- 2010 – Illinois’ 12th congressional district (D) – won
John Martin Costello
- 1932 – California’s 15th congressional district (D) – lost
- 1934 – California’s 15th congressional district (D) – won
- 1936 – California’s 15th congressional district (D, Prog.) – won
- 1938 – California’s 15th congressional district (D) – won
- 1940 – California’s 15th congressional district (D) – won
- 1942 – California’s 15th congressional district (D, R) – won
Lewis M. Costello
- 1984 – Virginia’s 7th congressional district (D) – lost
Paul G. Costello
- 1982 – New York’s 2nd congressional district (R, CON) – lost
Ryan A. Costello
- 2014 – Pennsylvania’s 6th congressional district (R) – won
- 2016 – Pennsylvania’s 6th congressional district (R) – won
T. E. Costello
- 1928 – Pennsylvania’s 23rd congressional district (D) – lost
Timothy W. Costello
- 1960 – New York’s 15th congressional district (Liberal) – lost
Edward A. Costigan
- 1970 – New Jersey’s 4th congressional district (R) – lost
Edward Prentiss Costigan
- 1930 – United States Senate (Colorado) (D) – won
Mark Costley
- 1996 – North Carolina’s 6th congressional district (D) – lost
William M. Costley
- 1954 – California’s 22nd congressional district (D) – lost
H. A. Costner
- 1938 – South Carolina’s 4th congressional district (R) – lost
Hyman Costrill
- 1934 – New York’s 8th congressional district (I) – lost
Joseph Cote
- 1982 – Michigan’s 18th congressional district (L) – lost
Tom Cottar
- 1998 – Texas’ 9th congressional district (R) – lost
William Ross Cotter
- 1970 – Connecticut’s 1st congressional district (D) – won
- 1972 – Connecticut’s 1st congressional district (D) – won
- 1974 – Connecticut’s 1st congressional district (D) – won
- 1976 – Connecticut’s 1st congressional district (D) – won
- 1978 – Connecticut’s 1st congressional district (D) – won
- 1980 – Connecticut’s 1st congressional district (D) – won
George Fletcher Cotterill
- 1920 – United States Senate (Washington) (D) – lost
Homer S. Cotton
- 1938 – Missouri’s 8th congressional district (R) – lost
Jacqueline M. Cotton
- 1974 – Michigan’s 1st congressional district (Labor) – lost
Norris H. Cotton
- 1946 – New Hampshire’s 2nd congressional district (R) – won
- 1948 – New Hampshire’s 2nd congressional district (R) – won
- 1950 – New Hampshire’s 2nd congressional district (R) – won
- 1952 – New Hampshire’s 2nd congressional district (R) – won
- 1954 – United States Senate (New Hampshire) (Special) (D) – won
- 1956 – United States Senate (New Hampshire) (R) – won
- 1962 – United States Senate (New Hampshire) (R) – won
- 1968 – United States Senate (New Hampshire) (R) – won
Paul Cotton
- 1936 – Pennsylvania’s 21st congressional district (S) – lost
Thomas Bryant Cotton
- 2012 – Arkansas’ 4th congressional district (R) – won
- 2014 – United States Senate (Arkansas) (R) – won
- 2020 – United States Senate (Arkansas) (R) – won
Dana Cottrell
- 2018 – Florida’s 11th congressional district (D) – lost
Harry Couch
- 1976 – California’s 30th congressional district (R) – lost
Jerome B. Couch
- 1972 – United States Senate (Alabama) (AL Proh.) – lost
- 1978 – United States Senate (Alabama) (Proh.) – lost
- 1980 – Alabama’s 2nd congressional district (Statesman) – lost
Natalie F. Couch
- 1934 – New York’s at large congressional district (R) – lost
- 1936 – New York’s at large congressional district (R) – lost
Frederic Rene Coudert, Jr.
- 1946 – New York’s 17th congressional district (R) – won
- 1948 – New York’s 17th congressional district (R) – won
- 1950 – New York’s 17th congressional district (R) – won
- 1952 – New York’s 17th congressional district (R) – won
- 1954 – New York’s 17th congressional district (R) – won
- 1956 – New York’s 17th congressional district (R) – won
Clarence Dennis Coughlin
- 1920 – Pennsylvania’s 11th congressional district (R) – won
- 1922 – Pennsylvania’s 12th congressional district (R) – lost
Daniel J. Coughlin
- 1936 – Massachusetts’ 5th congressional district (D) – lost
