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|  | Cabell, Earle | D | TX | U.S. House | 1965 – 1973 |
| | Caffery, Patrick Thomson | D | LA | U.S. House | 1969 – 1973 |
| | Cahill, William Thomas | R | NJ | U.S. House | 1959 – 1970 |
| | Cain, Harry Pulliam | R | WA | U.S. Senate | 1947 – 1953 |
| | Callahan, Herbert Leon | R | AL | U.S. House | 1985 – 2003 |
| | Callan, Clair Armstrong | D | NE | U.S. House | 1965 – 1967 |
| | Callaway, Howard Hollis | R | GA | U.S. House | 1965 – 1967 |
| | Calvert, Ken | R | CA | U.S. House | 1993 – 2025 |
| | Cameron, Ronald Brooks | D | CA | U.S. House | 1963 – 1967 |
| | Cammack, Kat | R | FL | U.S. House | 2021 – 2025 |
| | Camp, Albert Sidney | D | GA | U.S. House | 1945 – 1954 |
| | Camp, Dave | R | MI | U.S. House | 1991 – 2015 |
| | Camp, John Newbold (Happy) | R | OK | U.S. House | 1969 – 1975 |
| | Campbell, Ben Nighthorse | R | CO | U.S. Senate | 1987 – 2005 |
| | Campbell, Carroll Ashmore, Jr. | R | SC | U.S. House | 1979 – 1987 |
| | Campbell, Courtney Warren | D | FL | U.S. House | 1953 – 1955 |
| | Campbell, Howard Edmond | R | PA | U.S. House | 1945 – 1947 |
| | Campbell, John | R | CA | U.S. House | 2005 – 2015 |
| | Campbell, Tom | R | CA | U.S. House | 1989 – 2001 |
| | Canady, Charles T. | R | FL | U.S. House | 1993 – 2001 |
| | Canfield, Gordon | R | NJ | U.S. House | 1945 – 1961 |
| | Cannon, Arthur Patrick | D | FL | U.S. House | 1945 – 1947 |
| | Cannon, Chris | R | UT | U.S. House | 1997 – 2009 |
| | Cannon, Clarence Andrew | D | MO | U.S. House | 1945 – 1964 |
| | Cannon, Howard Walter | D | NV | U.S. Senate | 1959 – 1983 |
| | Canseco, Francisco "Quico" | R | TX | U.S. House | 2011 – 2013 |
| | Cantor, Eric | R | VA | U.S. House | 2001 – 2014 |
| | Cantwell, Maria | D | WA | U.S. Senate | 1993 – 2025 |
| | Cao, Anh Joseph | R | LA | U.S. House | 2009 – 2011 |
| | Capehart, Homer Earl | R | IN | U.S. Senate | 1945 – 1963 |
| | Capito, Shelley | R | WV | U.S. Senate | 2001 – 2027 |
| | Capper, Arthur | R | KS | U.S. Senate | 1943 – 1949 |
| | Capps, Lois | D | CA | U.S. House | 1998 – 2017 |
| | Capps, Walter Holden | D | CA | U.S. House | 1997 – 1997 |
| | Capuano, Michael E. | D | MA | U.S. House | 1999 – 2019 |
| | Caputo, Bruce Faulkner | R | NY | U.S. House | 1977 – 1979 |
| | Caraveo, Yadira | D | CO | U.S. House | 2023 – 2025 |
| | Carbajal, Salud | D | CA | U.S. House | 2017 – 2025 |
| | Cardenas, Tony | D | CA | U.S. House | 2013 – 2025 |
| | Cardin, Benjamin | D | MD | U.S. Senate | 1987 – 2025 |
| | Cardoza, Dennis | D | CA | U.S. House | 2003 – 2012 |
| | Carey, Hugh Leo | D | NY | U.S. House | 1961 – 1975 |
| | Carey, Mike | R | OH | U.S. House | 2021 – 2025 |
| | Carl, Jerry | R | AL | U.S. House | 2021 – 2025 |
| | Carlson, Cliffard Dale | R | IL | U.S. House | 1972 – 1973 |
| | Carlson, Frank | R | KS | U.S. Senate | 1935 – 1969 |
| | Carlyle, Frank Ertel | D | NC | U.S. House | 1949 – 1957 |
| | Carman, Gregory Wright | R | NY | U.S. House | 1981 – 1983 |
| | Carnahan, Albert Sidney Johnson | D | MO | U.S. House | 1945 – 1961 |
| | Carnahan, Jean | D | MO | U.S. Senate | 2001 – 2002 |
| | Carnahan, Russ | D | MO | U.S. House | 2005 – 2013 |
| | Carney, Charles Joseph | D | OH | U.S. House | 1970 – 1979 |
| | Carney, Christopher | D | PA | U.S. House | 2007 – 2011 |
| | Carney, John | D | DE | U.S. House | 2011 – 2017 |
| | Carney, William | R | NY | U.S. House | 1979 – 1987 |
| | Carper, Thomas | D | DE | U.S. Senate | 1983 – 2025 |
| | Carr, Milton Robert (Bob) | D | MI | U.S. House | 1975 – 1995 |
| | Carrigg, Joseph Leonard | R | PA | U.S. House | 1951 – 1959 |
| | Carroll, John Albert | D | CO | U.S. Senate | 1947 – 1963 |
| | Carson, Andre | D | IN | U.S. House | 2008 – 2025 |
| | Carson, Brad | D | OK | U.S. House | 2001 – 2005 |
| | Carson, Henderson Haverfield | R | OH | U.S. House | 1947 – 1949 |
| | Carson, Julia | D | IN | U.S. House | 1997 – 2007 |
| | Carter, Earl | R | GA | U.S. House | 2015 – 2025 |
| | Carter, John | R | TX | U.S. House | 2003 – 2025 |
| | Carter, Steven V. | D | IA | U.S. House | 1959 – 1959 |
| | Carter, Tim Lee | R | KY | U.S. House | 1965 – 1981 |
| | Carter, Troy | D | LA | U.S. House | 2021 – 2025 |
| | Cartwright, Matt | D | PA | U.S. House | 2013 – 2025 |
| | Carville, Edward Peter | D | NV | U.S. Senate | 1945 – 1947 |
| | Casar, Greg | D | TX | U.S. House | 2023 – 2025 |
| | Case, Clifford Philip | R | NJ | U.S. Senate | 1945 – 1979 |
| | Case, Ed | D | HI | U.S. House | 2003 – 2025 |
| | Case, Francis Higbee | R | SD | U.S. Senate | 1945 – 1962 |
| | Casey, Bob | D | PA | U.S. Senate | 2007 – 2025 |
| | Casey, Robert Randolph | D | TX | U.S. House | 1959 – 1977 |
| | Cassidy, Bill | R | LA | U.S. Senate | 2009 – 2027 |
| | Casten, Sean | D | IL | U.S. House | 2019 – 2025 |
| | Castle, Michael N. | R | DE | U.S. House | 1993 – 2011 |
| | Castor, Kathy | D | FL | U.S. House | 2007 – 2025 |
| | Castro, Joaquin | D | TX | U.S. House | 2013 – 2025 |
| | Cavalcante, Anthony | D | PA | U.S. House | 1949 – 1952 |
| | Cavanaugh, John Joseph | D | NE | U.S. House | 1977 – 1981 |
| | Cawthorn, Madison | R | NC | U.S. House | 2021 – 2023 |
| | Cazayoux, Don | D | LA | U.S. House | 2008 – 2009 |
| | Cederberg, Elford Albin | R | MI | U.S. House | 1953 – 1979 |
| | Celler, Emanuel | D | NY | U.S. House | 1923 – 1973 |
| | Chabot, Steve | R | OH | U.S. House | 1995 – 2023 |
| | Chadwick, E. Wallace | R | PA | U.S. House | 1947 – 1949 |
| | Chafee, John Hubbard | R | RI | U.S. Senate | 1976 – 1999 |
| | Chafee, Lincoln | R | RI | U.S. Senate | 1999 – 2007 |
| | Chaffetz, Jason | R | UT | U.S. House | 2009 – 2017 |
| | Chamberlain, Charles Ernest | R | MI | U.S. House | 1957 – 1975 |
| | Chambliss, Saxby | R | GA | U.S. Senate | 1995 – 2015 |
| | Chandler, Albert Benjamin ('Happy') | D | KY | U.S. Senate | 1939 – 1945 |
| | Chandler, Ben | D | KY | U.S. House | 2004 – 2013 |
| | Chandler, Rodney Dennis | R | WA | U.S. House | 1983 – 1993 |
| | Chapman, Jim | D | TX | U.S. House | 1985 – 1997 |
| | Chapman, Virgil Munday | D | KY | U.S. Senate | 1945 – 1951 |
| | Chappell, William Venroe, Jr. | D | FL | U.S. House | 1969 – 1989 |
| | Chappie, Eugene A. | R | CA | U.S. House | 1981 – 1987 |
| | Chase, Jackson Burton | R | NE | U.S. House | 1955 – 1957 |
| | Chatham, Richard Thurmond | D | NC | U.S. House | 1949 – 1957 |
| | Chavez, Dennis | D | NM | U.S. Senate | 1945 – 1962 |
| | Chavez-DeRemer, Lori | R | OR | U.S. House | 2023 – 2025 |
| | Chelf, Frank Leslie | D | KY | U.S. House | 1945 – 1967 |
| | Cheney, Liz | R | WY | U.S. House | 2017 – 2023 |
| | Cheney, Richard Bruce | R | | U.S. Senate | 1979 – 2009 |
| | Chenoweth, Helen | R | ID | U.S. House | 1995 – 2001 |
| | Chenoweth, John Edgar | R | CO | U.S. House | 1945 – 1965 |
| | Cherfilus-McCormick, Sheila | D | FL | U.S. House | 2022 – 2025 |
| | Chesney, Chester Anton | D | IL | U.S. House | 1949 – 1952 |
| | Chiesa, Jeff | R | NJ | U.S. Senate | 2013 – 2013 |
| | Childers, Travis W. | D | MS | U.S. House | 2008 – 2011 |
| | Chiles, Lawton Mainor, Jr | D | FL | U.S. Senate | 1971 – 1991 |
| | Chiperfield, Robert Bruce | R | IL | U.S. House | 1939 – 1963 |
| | Chisholm, Shirley Anita | D | NY | U.S. House | 1969 – 1983 |
| | Chocola, Chris | R | IN | U.S. House | 2003 – 2007 |
| | Christensen, Jon | R | NE | U.S. House | 1995 – 1999 |
| | Christopher, George Henry | D | MO | U.S. House | 1949 – 1959 |
| | Chrysler, Dick | R | MI | U.S. House | 1995 – 1997 |
| | Chu, Judy | D | CA | U.S. House | 2009 – 2025 |
| | Chudoff, Earl | D | PA | U.S. House | 1949 – 1958 |
| | Church, Frank Forrester | D | ID | U.S. Senate | 1957 – 1981 |
| | Church, Marguerite Stitt | R | IL | U.S. House | 1951 – 1963 |
| | Church, Ralph Edwin | R | IL | U.S. House | 1935 – 1950 |
| | Cicilline, David | D | RI | U.S. House | 2011 – 2023 |
| | Ciscomani, Juan | R | AZ | U.S. House | 2023 – 2025 |
| | Cisneros, Gil | D | CA | U.S. House | 2019 – 2021 |
| | Clancy, Donald Daniel | R | OH | U.S. House | 1961 – 1977 |
| | Clardy, Kit Francis | R | MI | U.S. House | 1953 – 1955 |
| | Clark, Frank Monroe | D | PA | U.S. House | 1955 – 1975 |
| | Clark, Jerome Bayard | D | NC | U.S. House | 1945 – 1949 |
| | Clark, Joseph Sill | D | PA | U.S. Senate | 1957 – 1969 |
| | Clark, Katherine | D | MA | U.S. House | 2013 – 2025 |
| | Clark, Richard Clarence (Dick) | D | IA | U.S. Senate | 1973 – 1979 |
| | Clarke, Hansen | D | MI | U.S. House | 2011 – 2013 |
| | Clarke, James McClure | D | NC | U.S. House | 1983 – 1991 |
| | Clarke, Yvette | D | NY | U.S. House | 2007 – 2025 |
| | Clason, Charles Russell | R | MA | U.S. House | 1945 – 1949 |
| | Clausen, Donald Holst | R | CA | U.S. House | 1963 – 1983 |
| | Clawson, Curt | R | FL | U.S. House | 2014 – 2017 |
| | Clawson, Delwin Morgan | R | CA | U.S. House | 1963 – 1979 |
| | Clay, William Lacy | D | MO | U.S. House | 2001 – 2021 |
| | Clay, William | D | MO | U.S. House | 1969 – 2001 |
| | Clayton, Eva M. | D | NC | U.S. House | 1993 – 2003 |
| | Cleaver, Emanuel | D | MO | U.S. House | 2005 – 2025 |
| | Cleland, Max | D | GA | U.S. Senate | 1995 – 2003 |
| | Clement, Robert | D | TN | U.S. House | 1988 – 2003 |
| | Clemente, Louis Gary | D | NY | U.S. House | 1949 – 1953 |
| | Clements, Earle C | D | KY | U.S. Senate | 1945 – 1957 |
| | Cleveland, James Colgate | R | NH | U.S. House | 1963 – 1981 |
| | Clevenger, Cliff | R | OH | U.S. House | 1945 – 1959 |
| | Clevenger, Raymond Francis | D | MI | U.S. House | 1965 – 1967 |
| | Cline, Ben | R | VA | U.S. House | 2019 – 2025 |
| | Clinger, William Floyd, Jr. | R | PA | U.S. House | 1979 – 1997 |
| | Clinton, Hillary Rodham | D | NY | U.S. Senate | 2001 – 2009 |
| | Clippinger, Roy | R | IL | U.S. House | 1945 – 1949 |
| | Cloud, Michael | R | TX | U.S. House | 2018 – 2025 |
| | Clyburn, James | D | SC | U.S. House | 1993 – 2025 |
| | Clyde, Andrew | R | GA | U.S. House | 2021 – 2025 |
| | Coad, Merwin | D | IA | U.S. House | 1957 – 1963 |
| | Coats, Dan | R | IN | U.S. Senate | 1981 – 2017 |
| | Cobey, William Wilfred, Jr. | R | NC | U.S. House | 1985 – 1987 |
| | Coble, Howard | R | NC | U.S. House | 1985 – 2015 |
| | Coburn, Tom | R | OK | U.S. Senate | 1995 – 2015 |
| | Cochran, John Joseph | D | MO | U.S. House | 1945 – 1947 |
| | Cochran, Thad | R | MS | U.S. Senate | 1973 – 2018 |
| | Coelho, Anthony Lee | D | CA | U.S. House | 1979 – 1989 |
| | Coffee, John Main | D | WA | U.S. House | 1945 – 1947 |
| | Coffey, Robert Lewis, Jr. | D | PA | U.S. House | 1949 – 1949 |
| | Coffin, Frank Morey | D | ME | U.S. House | 1957 – 1961 |
| | Coffin, Howard Aldridge | R | MI | U.S. House | 1947 – 1949 |
| | Coffman, Mike | R | CO | U.S. House | 2009 – 2019 |
| | Cohelan, Jeffery | D | CA | U.S. House | 1959 – 1972 |
| | Cohen, Steve | D | TN | U.S. House | 2007 – 2025 |
| | Cohen, William | R | ME | U.S. Senate | 1973 – 1997 |
| | Cole, Albert McDonald | R | KS | U.S. House | 1945 – 1953 |
| | Cole, Tom | R | OK | U.S. House | 2003 – 2025 |
| | Cole, William Clay | R | MO | U.S. House | 1945 – 1955 |
| | Cole, William Sterling | R | NY | U.S. House | 1945 – 1957 |
| | Coleman, Earl Thomas | R | MO | U.S. House | 1977 – 1993 |
| | Coleman, Norm | R | MN | U.S. Senate | 2003 – 2009 |
| | Coleman, Ronald D'Emory | D | TX | U.S. House | 1983 – 1997 |
| | Collier, Harold Reginald | R | IL | U.S. House | 1957 – 1975 |
| | Collins, Barbara-Rose | D | MI | U.S. House | 1991 – 1997 |
| | Collins, Cardiss | D | IL | U.S. House | 1973 – 1997 |
| | Collins, Chris | R | NY | U.S. House | 2013 – 2019 |
| | Collins, Doug | R | GA | U.S. House | 2013 – 2021 |
| | Collins, George Washington | D | IL | U.S. House | 1970 – 1972 |
| | Collins, James Mitchell | R | TX | U.S. House | 1968 – 1983 |
| | Collins, Mac | R | GA | U.S. House | 1993 – 2005 |
| | Collins, Mike | R | GA | U.S. House | 2023 – 2025 |
| | Collins, Susan | R | ME | U.S. Senate | 1997 – 2027 |
| | Colmer, William Meyers | D | MS | U.S. House | 1933 – 1973 |
| | Combest, Larry | R | TX | U.S. House | 1985 – 2003 |
| | Combs, Jesse Martin | D | TX | U.S. House | 1945 – 1953 |
| | Comer, James | R | KY | U.S. House | 2016 – 2025 |
| | Comstock, Barbara | R | VA | U.S. House | 2015 – 2019 |
| | Conable, Barber Benjamin, Jr. | R | NY | U.S. House | 1965 – 1985 |
| | Conaway, K. Michael | R | TX | U.S. House | 2005 – 2021 |
| | Condit, Gary A. | D | CA | U.S. House | 1989 – 2003 |
| | Condon, Robert Likens | D | CA | U.S. House | 1953 – 1955 |
| | Conlan, John Bertrand | R | AZ | U.S. House | 1973 – 1977 |
| | Connally, Thomas Terry (Tom) | D | TX | U.S. Senate | 1945 – 1953 |
| | Connolly, Gerald | D | VA | U.S. House | 2009 – 2025 |
| | Conover, William Sheldrick, II | R | PA | U.S. House | 1972 – 1975 |
| | Conrad, Kent | D | ND | U.S. Senate | 1987 – 2013 |
| | Conte, Silvio Ottavio | R | MA | U.S. House | 1959 – 1991 |
| | Conway, Conway | R | CA | U.S. House | 2022 – 2023 |
| | Conyers, John | D | MI | U.S. House | 1965 – 2017 |
| | Cook, Marlow Webster | R | KY | U.S. Senate | 1969 – 1974 |
| | Cook, Merrill | R | UT | U.S. House | 1997 – 2001 |
| | Cook, Paul | R | CA | U.S. House | 2013 – 2020 |
| | Cook, Robert Eugene | D | OH | U.S. House | 1959 – 1962 |
| | Cooksey, John C. | R | LA | U.S. House | 1997 – 2003 |
| | Cooley, Harold Dunbar | D | NC | U.S. House | 1945 – 1966 |
| | Cooley, Wes | R | OR | U.S. House | 1995 – 1997 |
| | Coon, Samuel Harrison | R | OR | U.S. House | 1953 – 1957 |
| | Coons, Chris | D | DE | U.S. Senate | 2010 – 2027 |
| | Cooper, Jere | D | TN | U.S. House | 1929 – 1957 |
| | Cooper, Jim | D | TN | U.S. House | 1983 – 2023 |
| | Cooper, John Sherman | R | KY | U.S. Senate | 1947 – 1973 |
| | Coppersmith, Samuel G. | D | AZ | U.S. House | 1993 – 1995 |
| | Corbett, Robert James | R | PA | U.S. House | 1945 – 1971 |
| | Corcoran, Thomas Joseph | R | IL | U.S. House | 1977 – 1985 |
| | Cordon, Guy | R | OR | U.S. Senate | 1945 – 1955 |
| | Corker, Bob | R | TN | U.S. Senate | 2007 – 2019 |
| | Corman, James Charles | D | CA | U.S. House | 1961 – 1981 |
| | Cornell, Robert John | D | WI | U.S. House | 1975 – 1979 |
| | Cornwell, David Lance | D | IN | U.S. House | 1977 – 1979 |
| | Cornyn, John | R | TX | U.S. Senate | 2002 – 2027 |
| | Correa, Lou | D | CA | U.S. House | 2017 – 2025 |
| | Corzine, Jon | D | NJ | U.S. Senate | 2001 – 2007 |
| | Costa, Jim | D | CA | U.S. House | 2005 – 2025 |
| | Costello, Jerry F. | D | IL | U.S. House | 1988 – 2013 |
| | Costello, Ryan A. | R | PA | U.S. House | 2015 – 2019 |
| | Cotter, William Ross | D | CT | U.S. House | 1971 – 1981 |
| | Cotton, Norris H. | R | NH | U.S. Senate | 1947 – 1975 |
| | Cotton, Tom | R | AR | U.S. Senate | 2013 – 2027 |
| | Coudert, Frederic Rene, Jr. | R | NY | U.S. House | 1947 – 1959 |
| | Coughlin, Robert Lawrence | R | PA | U.S. House | 1969 – 1993 |
| | Courter, James Andrew | R | NJ | U.S. House | 1979 – 1991 |
| | Courtney, Joe | D | CT | U.S. House | 2007 – 2025 |
| | Courtney, William Wirt | D | TN | U.S. House | 1945 – 1949 |
| | Coverdell, Paul | R | GA | U.S. Senate | 1992 – 2000 |
| | Cowan, William "Mo" | D | MA | U.S. Senate | 2013 – 2013 |
| | Cowger, William Owen | R | KY | U.S. House | 1967 – 1972 |
| | Cox, Christopher | R | CA | U.S. House | 1989 – 2005 |
| | Cox, Edward Eugene | D | GA | U.S. House | 1945 – 1952 |
| | Cox, John W., Jr. | D | IL | U.S. House | 1991 – 1993 |
| | Cox, TJ | D | CA | U.S. House | 2019 – 2021 |
| | Coyne, James Kitchenman, III | R | PA | U.S. House | 1981 – 1983 |
| | Coyne, William J. | D | PA | U.S. House | 1981 – 2003 |
| | Craig, Angie | D | MN | U.S. House | 2019 – 2025 |
| | Craig, Larry E | R | ID | U.S. Senate | 1981 – 2009 |
| | Craley, Nathaniel Neiman, Jr. | D | PA | U.S. House | 1965 – 1967 |
| | Cramer, Kevin | R | ND | U.S. Senate | 2013 – 2025 |
| | Cramer, Robert E. Bud | D | AL | U.S. House | 1991 – 2009 |
| | Cramer, William Cato | R | FL | U.S. House | 1955 – 1971 |
| | Crane, Daniel Bever | R | IL | U.S. House | 1979 – 1985 |
| | Crane, Eli | R | AZ | U.S. House | 2023 – 2025 |
| | Crane, Philip M. | R | IL | U.S. House | 1969 – 2005 |
| | Cranston, Alan | D | CA | U.S. Senate | 1969 – 1993 |
| | Crapo, Michael | R | ID | U.S. Senate | 1993 – 2029 |
| | Cravaack, Chip | R | MN | U.S. House | 2011 – 2013 |
| | Cravens, William Fadjo | D | AR | U.S. House | 1945 – 1949 |
| | Crawford, Fred Lewis | R | MI | U.S. House | 1945 – 1953 |
| | Crawford, Rick | R | AR | U.S. House | 2011 – 2025 |
| | Cremeans, Frank | R | OH | U.S. House | 1995 – 1997 |
| | Crenshaw, Ander | R | FL | U.S. House | 2001 – 2017 |
| | Crenshaw, Daniel | R | TX | U.S. House | 2019 – 2025 |
| | Cretella, Albert William | R | CT | U.S. House | 1953 – 1959 |
| | Crippa, Edward David | R | WY | U.S. Senate | 1954 – 1961 |
| | Crist, Charlie | D | FL | U.S. House | 2017 – 2022 |
| | Critz, Mark | D | PA | U.S. House | 2010 – 2013 |
| | Crockett, George William, Jr. | D | MI | U.S. House | 1980 – 1991 |
| | Crockett, Jasmine | D | TX | U.S. House | 2023 – 2025 |
| | Cronin, Paul William | R | MA | U.S. House | 1973 – 1975 |
| | Crook, Thurman Charles | D | IN | U.S. House | 1949 – 1952 |
| | Crosser, Robert | D | OH | U.S. House | 1945 – 1955 |
| | Crow, Jason | D | CO | U.S. House | 2019 – 2025 |
| | Crow, William Josiah | R | PA | U.S. House | 1947 – 1949 |
| | Crowley, Joseph | D | NY | U.S. House | 1999 – 2019 |
| | Crumpacker, Shepard J., Jr. | R | IN | U.S. House | 1951 – 1957 |
| | Cruz, Ted | R | TX | U.S. Senate | 2013 – 2025 |
| | Cubin, Barbara | R | WY | U.S. House | 1995 – 2009 |
| | Cuellar, Henry | D | TX | U.S. House | 2005 – 2025 |
| | Culberson, John | R | TX | U.S. House | 2001 – 2019 |
| | Culver, John Chester | D | IA | U.S. Senate | 1965 – 1981 |
| | Cummings, Elijah E. | D | MD | U.S. House | 1996 – 2019 |
| | Cunningham, Glenn Clarence | R | NE | U.S. House | 1957 – 1972 |
| | Cunningham, Joe | D | SC | U.S. House | 2019 – 2021 |
| | Cunningham, John Edward, III | R | WA | U.S. House | 1977 – 1979 |
| | Cunningham, Paul Harvey | R | IA | U.S. House | 1945 – 1959 |
| | Cunningham, Randy Duke | R | CA | U.S. House | 1991 – 2005 |
| | Curbelo, Carlos | R | FL | U.S. House | 2015 – 2019 |
| | Curley, James Michael | D | MA | U.S. House | 1945 – 1947 |
| | Curlin, William Prather, Jr. | D | KY | U.S. House | 1971 – 1973 |
| | Curson, David A. | D | MI | U.S. House | 2012 – 2013 |
| | Curtin, Willard Sevier | R | PA | U.S. House | 1957 – 1967 |
| | Curtis, Carl Thomas | R | NE | U.S. Senate | 1939 – 1979 |
| | Curtis, John | R | UT | U.S. House | 2017 – 2025 |
| | Curtis, Laurence | R | MA | U.S. House | 1953 – 1963 |
| | Curtis, Thomas Bradford | R | MO | U.S. House | 1951 – 1969 |
| | Masto, Catherine Cortez | D | NV | U.S. Senate | 2017 – 2029 |