| Jesse Colvin | U.S. House | MD | Democratic | 1 |
| Nick Colvin | U.S. House | MI | Democratic | 1 |
| Jeffrey Colyer | U.S. House | KS | Republican | 1 |
| Neil Combee | U.S. House | FL | Republican | 1 |
| Gwendolynn Millen Combs | U.S. House | AR | Democratic | 1 |
| Jack Lewis Combs Jr. | U.S. House | VA | Democratic | 1 |
| James Comer | U.S. House | KY | Republican | 1 |
| Stephen Bradley,Sr Comley | President | US | Republican | 1 |
| William Dakota Compton | U.S. House | KY | Democratic | 1 |
| Barbara Comstock | U.S. House | VA | Republican | 2 |
| Herb MD Conaway | U.S. House | NJ | Democratic | 1 |
| Michael Honorable Conaway | U.S. House | TX | Republican | 1 |
| Robert Dean Conaway | U.S. House | CA | Democratic | 1 |
| Bill Condict | U.S. House | TX | Republican | 1 |
| James Joseph Condit Jr. | U.S. House | OH | W | 1 |
| Chad Conerly | U.S. House | LA | Republican | 1 |
| Christine Marie Conforti | U.S. House | NJ | Democratic | 1 |
| Niki Conforti | U.S. House | IL | Republican | 2 |
| Dylan Conley | U.S. House | RI | Democratic | 1 |
| Kevin Robert Conley | U.S. House | WA | Independent | 1 |
| Chad Connelly | U.S. House | SC | Republican | 1 |
| Michael Lee Connely | U.S. House | NE | Republican | 1 |
| Lateefah B. Conner | U.S. House | GA | Democratic | 1 |
| James Henry Conn | U.S. Senate | CA | Green | 1 |
| Gerald Edward Connolly | U.S. House | VA | Democratic | 1 |
| Matthew D. Connolly | U.S. House | PA | Republican | 1 |
| Lucas Quentin Connor | President | US | Independent | 1 |
| Nicholas Connors | U.S. Senate | CT | Republican | 1 |
| Timothy W. Connors II | U.S. House | OH | Republican | 1 |
| Francis Conole | U.S. House | NY | Democratic | 1 |
| Henry Conoly | U.S. House | PA | Green | 1 |
| Rodney Lee Conover | U.S. House | CA | Republican | 1 |
| Audrey Conrad | President | US | Independent | 1 |
| William "Bill" Conrad | U.S. Senate | NV | Republican | 1 |
| William Bryan Conrad | U.S. Senate | NV | Republican | 1 |
| Carmela Conroy | U.S. House | WA | Democratic | 1 |
| Christopher Constant | U.S. House | AK | Democratic | 1 |
| Anthony Thomas Constantino | U.S. House | NY | Republican | 1 |
| Mary Ann Contogiannis | U.S. House | NC | Republican | 1 |
| Maya Contreras | U.S. House | NY | Democratic | 1 |
| Connie Conway | U.S. House | CA | Republican | 1 |
| Melissa Conyears-Ervin | U.S. House | IL | Democratic | 1 |
| Ian Conyers | U.S. House | MI | Democratic | 1 |
| John Conyers | U.S. House | MI | Democratic | 2 |
| John Conyers III | U.S. House | MI | Democratic | 1 |
| John Conyers Jr. | U.S. House | MI | Democratic | 1 |
| Brandon Lamar Cook | U.S. House | WI | Republican | 1 |
| John Martin Cooke Jr. | U.S. Senate | NC | Republican | 1 |
| Kevin Cooke | U.S. House | GA | Republican | 1 |
| Rebecca Cooke | U.S. House | WI | Democratic | 1 |
| Rebecca Cooke | U.S. House | WI | Democratic | 2 |
| Robert Spencer Cooke IV | President | US | Green | 1 |
| Kevin Cookingham | U.S. House | CA | Republican | 1 |
| Merrill Edward Sergeant Cook Jr. | President | US | UN | 2 |
| Paul Cook | U.S. House | CA | Republican | 1 |
| Marte Cooksey | President | US | Republican | 1 |
| Tamarkus Cook | U.S. House | GA | Democratic | 1 |
| Vaughn R. Cook | U.S. House | UT | OTH | 1 |
| Leslie Anne Coolidge | U.S. House | IL | Democratic | 1 |
| Christopher A. Coons | U.S. Senate | DE | Democratic | 1 |
| Brandon Shaw Cooper | U.S. House | SC | Republican | 1 |
| Bridgette L. Cooper | U.S. House | MD | Republican | 2 |
| Daniel J. (I.O.) Cooper | U.S. House | TN | Independent | 1 |
| David Charles Cooper | U.S. House | GA | Democratic | 1 |
| Derrick Wadell Cooper | President | US | APF | 1 |
| James H.S Cooper | U.S. House | TN | Democratic | 1 |
| James L. Cooper III | U.S. House | GA | Green | 1 |
| Jimmy Cooper | President | US | Independent | 1 |
| Kelly Cooper | U.S. House | AZ | Republican | 2 |
| Michael E. Pastor Cooper | U.S. Senate | TX | Democratic | 1 |
| Randal Dean Cooper | U.S. House | TN | Democratic | 1 |
| Richard D. Cooper | President | US | Democratic | 1 |
| Thad Chalmers Cooperrider | U.S. House | OH | Republican | 1 |
| Robert Cooper | U.S. House | CA | Democratic | 1 |
| Robert Washington Cooper Jr. | President | US | Independent | 1 |
| Scott Cooper | U.S. House | NC | Democratic | 1 |
| Terri Kay Cooper | U.S. House | WA | Republican | 1 |
| Donald R. Cope | President | US | Independent | 1 |
| Roy Dale Cope | U.S. Senate | TN | Republican | 1 |
| Rick Coplen | U.S. House | PA | Democratic | 2 |
| Jimmy Dale Copley II | U.S. Senate | WV | Republican | 1 |
| Don Coram | U.S. House | CO | Republican | 1 |
| Charly Corazon | U.S. House | AZ | Republican | 1 |
| Keith Corbett | U.S. House | NY | Democratic | 1 |
| Shavonnia Corbin-Johnson | U.S. House | PA | Democratic | 1 |
| Michael Allen Corbin | U.S. House | GA | Republican | 1 |
| Vincent Dean Cordova Jr. | President | US | NON | 1 |
| Vincent Dean Cordova Jr. | President | US | Independent | 1 |
| Gene Corey | U.S. House | CA | Republican | 1 |
| Matthew McKinnon Corey | U.S. Senate | CT | Republican | 2 |
| Seth Corey | U.S. House | OH | Democratic | 1 |
| Robert P. Corker Jr. | U.S. Senate | TN | Republican | 1 |
| David Neil Cornejo | U.S. House | HI | Democratic | 1 |
| Gabriel Cornejo | President | US | Democratic | 1 |
| Robert Michael Cpt Cornicelli | U.S. House | NY | Republican | 1 |
| Alex Cornwallis | U.S. House | TX | Democratic | 1 |
| Stephen Cornwell | U.S. House | NY | Republican | 1 |
| John Cornyn | U.S. Senate | TX | Republican | 5 |
| Lou Correa | U.S. House | CA | Democratic | 1 |
| Cait Corrigan | U.S. House | NY | Republican | 1 |
| Kyle Corrigan | U.S. Senate | WI | Republican | 2 |
| Jesse Andrew Corson | President | US | UN | 1 |
| Rodolfo Cortes Barragan | U.S. House | CA | Green | 1 |
| Philip Shaun Cortese | President | US | W | 2 |
| Jose Marcos Cortes | U.S. House | CA | PFP | 1 |
| Jose Santos Cortes Jr. | President | US | Republican | 2 |
| Catherine Cortez Masto | U.S. Senate | NV | Democratic | 2 |
| Raul Ivhan Cortina | President | US | Independent | 1 |
| Michael James Cortney | U.S. House | WA | Republican | 1 |
| Ruben Corvalan | U.S. House | TX | Libertarian | 1 |
| Steven J. Corvi | U.S. House | RI | Republican | 1 |
| Kathleen M. Cosgrove | U.S. House | TN | Independent | 1 |
| Sebastian Cosme | President | US | Independent | 1 |
| Sebastian Oscar Cosme | President | US | AIC | 1 |
| Shawn Paul Cosner | U.S. House | WV | W | 1 |
| Gary Lynn Coson | U.S. Senate | MN | Republican | 1 |
| Dianne Salvagno Costa | U.S. House | TX | Republican | 1 |
| Jim Costa | U.S. House | CA | Democratic | 1 |
| Michael Costa | U.S. Senate | RI | Independent | 1 |
| Michael J. Costa | U.S. Senate | RI | Democratic | 1 |
| David Allen Costello | U.S. Senate | ME | Democratic | 1 |
| Jerry F. Costello | U.S. House | IL | Democratic | 1 |
| Regis J. Costello | President | US | Independent | 1 |
| Ryan A. Costello | U.S. House | PA | Republican | 2 |
| Scott L. Costello | U.S. House | IN | Democratic | 1 |
| Jackie S. Cota | U.S. House | CA | Republican | 1 |
| Patricia A. Cotham | U.S. House | NC | Democratic | 1 |
| Missy Cotter Smasal | U.S. House | VA | Democratic | 1 |
| William Biddle Cotter | U.S. House | NY | Republican | 1 |
| Adam D. Cottillion | President | US | Independent | 1 |
| Thomas Cotton | U.S. Senate | AR | Republican | 4 |
| Dana Cottrell | U.S. House | FL | Democratic | 1 |
| Kevin Coughlin | U.S. House | OH | Republican | 3 |
| Chris Coulombe | U.S. House | CA | Republican | 1 |
| Joshua Coulter | President | US | Independent | 1 |
| Gordon Joe Counsil | U.S. House | ID | UNK | 1 |
| Amy Ryan Courser | U.S. House | OR | Republican | 1 |
| Joseph D. Courtney | U.S. House | CT | Democratic | 1 |
| Phil Covarrubias | U.S. House | TX | Republican | 1 |
| Carolyn Elizabeth Covell | U.S. House | CA | Republican | 1 |
| Michael Covert | U.S. House | SC | Republican | 1 |
| Daniel Cowan | U.S. House | GA | Republican | 1 |
| John Cowan | U.S. House | GA | Republican | 1 |
| Alex D. Cowans | President | US | Democratic | 1 |
| Anthony 'Tony' Cowden | U.S. House | NC | Republican | 1 |
| Martin Lindsey Cowen III | U.S. House | GA | Libertarian | 1 |
| Adrian J. 1999 Cox | President | US | Democratic | 1 |
| Amy Cox | U.S. House | OH | Democratic | 1 |
| Chris Cox | U.S. House | SC | Republican | 1 |
| Christopher Cox | U.S. House | CA | Republican | 1 |
| Dan Cox | U.S. House | MD | Republican | 1 |
| Donald Raymond Cox | U.S. House | NC | Republican | 1 |
| Steve Cox | U.S. House | CA | Independent | 1 |
| Steven Jewell Isom Cox | U.S. Senate | KY | Democratic | 1 |
| Terrence John (Tj) Cox | U.S. House | CA | Democratic | 1 |
| Thomas Phillip Cox | U.S. House | VA | Democratic | 1 |
| Elliott Dwight Cox-Wardrick | U.S. House | VA | Independent | 1 |
| Jeff Cozzens | U.S. House | NH | Republican | 1 |
| Vincent Darrell Crabb | U.S. House | TX | Republican | 1 |
| Frank S. Craft | U.S. House | FL | Libertarian | 1 |
| Dale Crafts | U.S. House | ME | Republican | 2 |
| Angela Dawn Craig | U.S. House | MN | Democratic | 1 |
| Christine E. Craig | U.S. House | PA | Democratic | 1 |
| Anduin Elim Craighill-Middleton | U.S. House | NC | Democratic | 1 |
| James Craig | U.S. Senate | MI | Republican | 1 |
| Jared Craig | U.S. House | GA | Republican | 1 |
| Jared B. Esq Craig | U.S. Senate | GA | Republican | 1 |
| Rufus Holt Craig | U.S. House | LA | Libertarian | 1 |
| Thomas James Craig Jr. | U.S. House | OK | Republican | 1 |
| Jo Crain | U.S. Senate | MO | Green | 1 |
| Mark Brewer Crain | U.S. House | TN | Independent | 1 |
| Kevin Cramer | U.S. Senate | ND | Republican | 5 |
| Robert E. "Bud" Cramer Jr. | U.S. House | AL | Democratic | 1 |
| Thomas Allen Cramer | U.S. House | WA | Democratic | 1 |
| Terry Lawrence Crandall | U.S. House | CA | NPA | 1 |
| Elenore Casey Crane | U.S. House | NH | Republican | 1 |
| Eli Crane | U.S. House | AZ | Republican | 3 |
| Michael Robert Crane | U.S. House | GA | Republican | 2 |
| Jeff Crank | U.S. House | CO | Republican | 1 |
| Michael D. Crapo | U.S. Senate | ID | Republican | 1 |
| Raymond J. Cravaack | U.S. House | MN | Republican | 1 |
| Michael Andrew Craven | U.S. House | KY | Republican | 1 |
| Mike Craven | U.S. House | KY | Republican | 3 |
| Maurice Randall, Cravens II | U.S. House | KY | W | 1 |
| Eric Alan Rick Crawford | U.S. House | AR | Republican | 2 |
| Ander Crenshaw | U.S. House | FL | Republican | 1 |
| Daniel Crenshaw | U.S. House | TX | Republican | 1 |
| Jean-Michel Creviere | U.S. House | MI | Green | 1 |
| Marcellus Crews | U.S. Senate | MD | Democratic | 1 |
| Oreta Tufaga-Mapu Crichton | U.S. House | AS | Democratic | 1 |
| Larry R. Crim | U.S. Senate | TN | Republican | 1 |
| Mark Cripe | U.S. House | CA | Republican | 1 |
| Michael Crispi | U.S. House | NJ | Republican | 1 |
| Charlie Joseph Crist | U.S. House | FL | Democratic | 1 |
| Calen Dean Cristiani | U.S. House | FL | Democratic | 1 |
| Terry Vincent Crist | U.S. House | OH | Republican | 2 |
| Jeff Criswell | U.S. House | GA | Republican | 1 |
| Jefferson Edward Criswell | U.S. House | GA | Republican | 1 |
| Karen Crnkovich | U.S. House | KS | Republican | 1 |
| Bruce Crochetiere | U.S. House | NH | Republican | 1 |