| Melinda Almonte | U.S. House | FL | Republican | 1 |
| Vance Steven Alm | U.S. House | NV | Democratic | 1 |
| Anthony Alongi | President | US | NNE | 1 |
| Teresa Alonso Leon | U.S. House | OR | Democratic | 1 |
| Salim Mohammed Al-Shatel | U.S. House | MI | Democratic | 1 |
| Angela Alsobrooks | U.S. Senate | MD | Democratic | 1 |
| James Dean Alspach | U.S. House | IN | Republican | 1 |
| Donna Jean Alston | President | US | Democratic | 1 |
| Girish Altekar | U.S. House | TX | Libertarian | 1 |
| Joel Levi Altman | President | US | Independent | 1 |
| Larry Thomas Altman III | U.S. House | VA | Republican | 1 |
| Susan Copius Altman | U.S. House | NJ | Democratic | 1 |
| James Altucher | President | US | UNK | 1 |
| Sheryl Francys Alu Campagna | U.S. House | HI | Democratic | 1 |
| Eliza Alvarado | U.S. House | TX | Democratic | 1 |
| Andrew Ruben Alvarez | U.S. House | TX | Republican | 1 |
| Simon Mark Alvarez | U.S. House | CA | Republican | 3 |
| Andrew Alvey | U.S. House | GA | Republican | 1 |
| Antonio Amador | U.S. House | CA | Republican | 1 |
| Melba S. S. Amaral | U.S. Senate | HI | Republican | 1 |
| Justin Amash | U.S. Senate | MI | Republican | 1 |
| Justin Amash | U.S. House | MI | Independent | 1 |
| Justin Amash | President | US | Libertarian | 1 |
| Thomas Marrion Amason III | U.S. House | AL | Republican | 1 |
| Aumua Amata | U.S. House | AS | Republican | 1 |
| Bruno Amato | U.S. House | CA | Democratic | 1 |
| Tahirah Amatul-Wadud | U.S. House | MA | Democratic | 1 |
| David Ambrose | U.S. House | AK | W | 1 |
| Mark Ambrose | U.S. House | MI | Republican | 1 |
| Nicolee Ambrose | U.S. House | MD | Republican | 1 |
| Aaron Amede | U.S. House | ME | NPA | 2 |
| Dane Amling | U.S. House | AZ | Democratic | 1 |
| Hichamd Ammi | U.S. House | FL | Democratic | 1 |
| Mark Eugene Amodei | U.S. House | NV | Republican | 1 |
| Gabriel F. Amo | U.S. House | RI | Democratic | 1 |
| Roland Elikplim Amouzou | U.S. Senate | FL | Independent | 1 |
| Akhenaten Hotep Amun | U.S. Senate | GA | Democratic | 1 |
| Joel Anabilah-Azumah | U.S. Senate | NY | NPA | 1 |
| Manga Manga Anantatmula | U.S. House | VA | Republican | 2 |
| Bob Anders | U.S. House | MO | Independent | 1 |
| Carl E. Andersen | U.S. House | CO | Republican | 1 |
| Jacob Kristopher Anders | U.S. House | TN | Democratic | 1 |
| Austin H. Anderson | U.S. House | SC | Republican | 1 |
| Byron Avery Anderson | U.S. House | AZ | Democratic | 1 |
| Chad D. Anderson | U.S. House | CA | NOP | 1 |
| Christopher M. Anderson | U.S. House | IL | Democratic | 1 |
| Danny Eugene Anderson | U.S. House | TX | Democratic | 1 |
| David Lee Anderson Jr. | U.S. House | TX | Democratic | 1 |
| Derrick Anderson | U.S. House | VA | Republican | 1 |
| Diane Anderson | U.S. House | WI | Democratic | 1 |
| Joseph Edward Pastor Anderson | President | US | Republican | 1 |
| Dwight A. Anderson | U.S. House | FL | Democratic | 1 |
| Elizabeth Anderson | U.S. House | AL | Democratic | 1 |
| Fareed Anderson | President | US | Republican | 1 |
| Jared Lyle Anderson | U.S. House | UT | Democratic | 1 |
| Jason Anderson | U.S. House | CA | Republican | 1 |
| Jeramey Dewayne Anderson | U.S. House | MS | Democratic | 1 |
| Jessica Lynne Anderson | U.S. House | VA | Democratic | 1 |
| Jo Anderson | U.S. House | IN | Democratic | 1 |
| John Carnan Anderson | U.S. House | TX | Republican | 1 |
| Joseph Edward Anderson Jr. | President | US | Republican | 1 |
| Joshua Anderson | President | US | Libertarian | 1 |
| Jule Anderson | President | US | Republican | 1 |
| Justin Anderson | U.S. House | CT | Republican | 1 |
| Kathleen Anderson | U.S. House | UT | Republican | 1 |
| Margaret Anderson Kelliher | U.S. House | MN | Democratic | 1 |
| Merrill Anderson | U.S. Senate | MN | Republican | 1 |
| Michael M. Anderson | President | US | — | 1 |
| Paul Anderson | U.S. House | NE | Republican | 1 |
| Phillip Norman Anderson | U.S. Senate | WI | Libertarian | 1 |
| Phillip Norman Anderson | U.S. Senate | WI | Independent | 1 |
| Quentin Anthony Anderson | U.S. House | LA | Democratic | 1 |
| Quinci Anderson | President | US | Republican | 1 |
| Rae Hart Anderson | U.S. Senate | MN | Republican | 1 |
| Robert Jon Anderson | U.S. House | LA | Democratic | 2 |
| Terell Anderson | U.S. House | AL | Democratic | 1 |
| Toby Anderson | U.S. House | NJ | Republican | 1 |
| Walter Anderson Jr. | President | US | Independent | 1 |
| Willie Jeffeerson Anderson | U.S. House | FL | Republican | 1 |
| Willie Jeffeerson Anderson | U.S. House | FL | Republican | 1 |
| Willie Jefferson Anderson Jr. | U.S. House | FL | Democratic | 1 |
| Christopher Ace Andrejka | President | US | UNK | 1 |
| Edward H. Andres | U.S. House | MO | Democratic | 1 |
| Aliscia Andrews | U.S. House | VA | Republican | 2 |
| Annie Andrews | U.S. House | SC | Democratic | 1 |
| Cody Andrews | U.S. Senate | TX | Republican | 1 |
| Naomi Andrews | U.S. House | OK | Democratic | 1 |
| Robert E. Andrews | U.S. Senate | NJ | Democratic | 1 |
| Robert E. Andrews | U.S. House | NJ | Democratic | 1 |
| Russ Albert Andrews | U.S. House | CO | Republican | 1 |
| Michael Andriani | U.S. House | NC | Republican | 1 |
| Tracy Andrus Sr. | U.S. Senate | TX | Democratic | 2 |
| Joseph Luis Andujo | U.S. House | CO | Republican | 1 |
| John Aneralla | U.S. House | NC | Republican | 1 |
| Angela Glass | President | US | Independent | 1 |
| Angela Angel | U.S. House | MD | Democratic | 1 |
| Scott Angelle | U.S. House | LA | Republican | 1 |
| Sharron E. Angle | U.S. House | NV | Republican | 1 |
| Sylvester Ugonna Ani Jr. | U.S. House | CA | Democratic | 1 |
| Lisa Ann Perry van Gray | U.S. House | NV | Democratic | 1 |
| Yassamin Ansari | U.S. House | AZ | Democratic | 1 |
| Chris Anstead | U.S. House | CA | Democratic | 1 |
| Niraj Jaimini Antani | U.S. House | OH | Republican | 1 |
| Charles Anthony | U.S. House | MD | Republican | 1 |
| Marlin Daniel Anthony | U.S. House | FL | Republican | 1 |
| Nakia Lacquers Anthony | President | US | Democratic | 1 |
| Stavros Anthony | U.S. House | NV | Republican | 1 |
| Gregory Antoine | U.S. Senate | NC | Democratic | 1 |
| Jeff Antonelli | U.S. House | TX | Democratic | 1 |
| Robert Joseph Antonellis | U.S. Senate | MA | Republican | 1 |
| Nicholas Antonucci | U.S. House | NY | Democratic | 1 |
| Jayden Antropov | U.S. House | FL | Republican | 1 |
| John Anthony Anzalone | U.S. House | NV | Democratic | 1 |
| Armando Anzoli | President | US | Republican | 1 |
| Rob Apodaca | U.S. House | NM | Democratic | 1 |
| David Applefield | U.S. House | NJ | Democratic | 1 |
| Douglas Loren Applegate | U.S. House | CA | Democratic | 1 |
| Darren Dione Aquino | U.S. House | FL | Republican | 1 |
| Paul Anthony Aquino | President | US | LRU | 1 |
| Jenai Aragona | U.S. House | TX | Republican | 1 |
| Eddy Aragon | U.S. House | NM | Republican | 1 |
| Roland Aranjo | President | US | Green | 1 |
| Larry Arata V III | U.S. House | PA | Democratic | 1 |
| Hector Araujo | U.S. House | AZ | Democratic | 1 |
| Phil Arballo | U.S. House | CA | Democratic | 2 |
| Jay Arbuckel | President | US | Republican | 1 |
| Daniel R. Arcangel | U.S. House | OR | Democratic | 1 |
| Soniacarmen Arcelay | President | US | NPA | 1 |
| Miguel Angel Arceo | U.S. House | CA | Democratic | 1 |
| Charles Wallace Archerd | U.S. House | NC | Republican | 1 |
| Destiny Archer | U.S. Senate | WA | Republican | 1 |
| Steven Archer | U.S. House | RI | Democratic | 1 |
| Bob Archuleta | U.S. House | CA | Democratic | 1 |
| Valdamar Archuleta | U.S. House | CO | Republican | 1 |
| Sorinne Frieda Ardeleanu | President | US | Independent | 1 |
| Robert Ardini | President | US | Republican | 1 |
| Chelsea Ardoin | U.S. House | LA | Republican | 1 |
| Sergio Arellano | U.S. House | AZ | Republican | 1 |
| Devin M. Arendt | President | US | NPA | 1 |
| Ashley Hinson Arenholz | U.S. House | IA | Republican | 2 |
| Norman Arevalo | President | US | Independent | 1 |
| Aaron Arguijo | U.S. Senate | TX | Democratic | 1 |
| Peter Steven Arianas | U.S. House | FL | Republican | 1 |
| Mohammad Arif | U.S. Senate | AZ | W | 1 |
| Valerie Arkoosh | U.S. Senate | PA | Democratic | 1 |
| Valerie Ann Arkoosh | U.S. House | PA | Democratic | 1 |
| Rob Arlett | U.S. Senate | DE | Republican | 1 |
| William Philip Arlinghaus | U.S. House | TN | Republican | 1 |
| David Michael Armas | U.S. Senate | MA | Independent | 1 |
| Irene Armendariz-Jackson | U.S. House | TX | Republican | 1 |
| Scott Armey | U.S. House | TX | Republican | 1 |
| Christopher Armitage | U.S. House | WA | Democratic | 1 |
| Derek Armstead | U.S. House | NJ | Democratic | 1 |
| Jay R. Armstrong | U.S. House | AK | W | 1 |
| Kelly Armstrong | U.S. House | ND | Republican | 1 |
| Kenneth Reed Armstrong | President | US | Libertarian | 1 |
| Michael Armstrong | U.S. House | TX | Republican | 1 |
| R. Mark Armstrong | U.S. Senate | WY | Republican | 1 |
| Sean Armstrong Armstrong | U.S. House | NJ | Libertarian | 1 |
| William L. Armstrong III | U.S. House | CO | Republican | 1 |
| Eugene Nathaniel Arnold III | President | US | W | 1 |
| James G. Arnold | U.S. House | CO | Republican | 1 |
| Marie Encar Arnold | U.S. Senate | CA | Democratic | 1 |
| Marie Encar A. Arnold | U.S. Senate | CA | Democratic | 1 |
| Elsie Arntzen | U.S. House | MT | Republican | 1 |
| Phillip Arnold Aronoff | U.S. House | TX | Republican | 1 |
| Harry Arora | U.S. House | CT | Republican | 1 |
| Joe Arpaio | U.S. Senate | AZ | Republican | 1 |
| Huwaida Arraf | U.S. House | MI | Democratic | 1 |
| Jennifer O'Farrill Arras | U.S. House | AL | Democratic | 1 |
| Francesco Arreaga | U.S. House | CA | Democratic | 1 |
| Alma D.D.S Arredondo-Lynch | U.S. House | TX | Republican | 1 |
| Alma G. D.D.S Arredondo-Lynch | U.S. House | TX | Republican | 1 |
| Jodey Cook Arrington | U.S. House | TX | Republican | 1 |
| Katherine Elizabeth Arrington | U.S. House | SC | Republican | 1 |
| Katie Arrington | U.S. House | SC | Republican | 1 |
| Randall Steven Phd Arrington | U.S. Senate | LA | Republican | 1 |
| Nathan Arroyave | U.S. House | IL | Democratic | 1 |
| Jaime Arrriola Jr. | U.S. House | TX | Republican | 1 |
| Jorge Artalejo | U.S. House | TX | Democratic | 1 |
| Matthew Pascual Artero | U.S. House | GU | Democratic | 1 |
| Michael E. Arth | President | US | Democratic | 1 |
| Barbara Arthur | U.S. House | SC | Republican | 1 |
| Erich Arvidson | U.S. House | MO | Democratic | 1 |
| Timothy C. Arview | U.S. Senate | IL | Republican | 1 |
| Dennis Aryan | U.S. House | VA | Independent | 1 |
| Kojo Asamoa-Caesar | U.S. House | OK | Democratic | 1 |
| Robert Asencio | U.S. House | FL | Democratic | 1 |
| Manuel P. Asensio | U.S. House | FL | Republican | 1 |
| William Chester Ashburn Jr. | President | US | W | 1 |
| Stephan Blake Ashby | U.S. House | MO | OTH | 1 |
| Stephan Blake Ashby | President | US | Libertarian | 1 |
| Lauren Ashcraft | U.S. House | NY | Democratic | 1 |
| Todd J. Ashcraft | President | US | Democratic | 1 |
| David Benjamin Ashe | U.S. House | VA | Democratic | 1 |
| Ann Ashford | U.S. House | NE | Democratic | 1 |
| Andrew Ashley | President | US | Independent | 1 |
| Richard E. Ashooh | U.S. House | NH | Republican | 1 |
| Joseph M. Ashton | President | US | IDP | 1 |
| Casey Askar | U.S. House | FL | Republican | 1 |