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|  | Conservative Republican Djou Wins Hawaii House Seat in Special Election | R | HI | U.S. House | 2010 – 2011 |
| | D'Alesandro, Thomas, Jr. | D | MD | U.S. House | 1939 – 1947 |
| | D'Amato, Alfonse M. | R | NY | U.S. Senate | 1981 – 1999 |
| | D'Esposito, Anthony | R | NY | U.S. House | 2023 – 2025 |
| | D'Ewart, Wesley Abner | R | MT | U.S. House | 1945 – 1955 |
| | Daddario, Emilio Quincy | D | CT | U.S. House | 1959 – 1972 |
| | Dague, Paul Bartram | R | PA | U.S. House | 1947 – 1966 |
| | Dahlkemper, Kathy | D | PA | U.S. House | 2009 – 2011 |
| | Daines, Steve | R | MT | U.S. Senate | 2013 – 2027 |
| | Danforth, John Claggett | R | MO | U.S. Senate | 1977 – 1995 |
| | Daniel, Charles Ezra | D | SC | U.S. Senate | 1954 – 1954 |
| | Daniel, Marion Price | D | TX | U.S. Senate | 1953 – 1957 |
| | Daniel, Robert Williams, Jr. | R | VA | U.S. House | 1973 – 1983 |
| | Daniel, Wilbur Clarence (Dan) | D | VA | U.S. House | 1969 – 1988 |
| | Daniels, Dominick Vincent | D | NJ | U.S. House | 1959 – 1977 |
| | Dannemeyer, William Edwin | R | CA | U.S. House | 1979 – 1993 |
| | Danner, Pat | D | MO | U.S. House | 1993 – 2001 |
| | Darby, Harry | R | KS | U.S. Senate | 1949 – 1950 |
| | Darden, George (Buddy) | D | GA | U.S. House | 1983 – 1995 |
| | Daschle, Tom | D | SD | U.S. Senate | 1979 – 2005 |
| | Daub, Harold John, Jr., (Hal) | R | NE | U.S. House | 1981 – 1989 |
| | Daughton, Ralph Hunter | D | VA | U.S. House | 1945 – 1947 |
| | Davenport, Harry James | D | PA | U.S. House | 1949 – 1952 |
| | Davids, Sharice | D | KS | U.S. House | 2019 – 2025 |
| | Davidson, Irwin Delmore | D | NY | U.S. House | 1955 – 1956 |
| | Davidson, Warren | R | OH | U.S. House | 2016 – 2025 |
| | Davies, John Clay | D | NY | U.S. House | 1949 – 1952 |
| | Davis, Artur | D | AL | U.S. House | 2003 – 2011 |
| | Davis, Clifford | D | TN | U.S. House | 1945 – 1965 |
| | Davis, Danny | D | IL | U.S. House | 1997 – 2025 |
| | Davis, David | R | TN | U.S. House | 2007 – 2009 |
| | Davis, Don | D | NC | U.S. House | 2023 – 2025 |
| | Davis, Geoff | R | KY | U.S. House | 2005 – 2012 |
| | Davis, Glenn Robert | R | WI | U.S. House | 1947 – 1974 |
| | Davis, Jack | R | IL | U.S. House | 1987 – 1989 |
| | Davis, James Curran | D | GA | U.S. House | 1947 – 1963 |
| | Davis, Jim | D | FL | U.S. House | 1997 – 2007 |
| | Davis, Jo Ann | R | VA | U.S. House | 2001 – 2009 |
| | Davis, John William | D | GA | U.S. House | 1961 – 1975 |
| | Davis, Lincoln | D | TN | U.S. House | 2003 – 2011 |
| | Davis, Mendel Jackson | D | SC | U.S. House | 1971 – 1981 |
| | Davis, Robert William | R | MI | U.S. House | 1979 – 1993 |
| | Davis, Rodney | R | IL | U.S. House | 2013 – 2023 |
| | Davis, Susan A. | D | CA | U.S. House | 2001 – 2021 |
| | Davis, Thomas M. III | R | VA | U.S. House | 1995 – 2009 |
| | Dawson, William Adams | R | UT | U.S. House | 1947 – 1959 |
| | Dawson, William Levi | D | IL | U.S. House | 1943 – 1970 |
| | Dayton, Mark | D | MN | U.S. Senate | 2001 – 2007 |
| | De La Cruz, Monica | R | TX | U.S. House | 2023 – 2025 |
| | De La Garza, Eligio, II (Kika) | D | TX | U.S. House | 1965 – 1997 |
| | De Lacy, Emerson Hugh | D | WA | U.S. House | 1945 – 1947 |
| | Deal, Nathan | R | GA | U.S. House | 1993 – 2010 |
| | Dean, Madeleine | D | PA | U.S. House | 2019 – 2025 |
| | Deane, Charles Bennett | D | NC | U.S. House | 1947 – 1957 |
| | Deckard, Huey Joel | R | IN | U.S. House | 1979 – 1983 |
| | Deconcini, Dennis Webster | D | AZ | U.S. Senate | 1977 – 1995 |
| | DeFazio, Peter | D | OR | U.S. House | 1987 – 2023 |
| | DeGette, Diana | D | CO | U.S. House | 1997 – 2025 |
| | Degraffenried, Edward | D | AL | U.S. House | 1949 – 1953 |
| | Delaney, James Joseph | D | NY | U.S. House | 1945 – 1979 |
| | Delaney, John Joseph | D | NY | U.S. House | 1918 – 1948 |
| | Delaney, John | D | MD | U.S. House | 2013 – 2019 |
| | DeLauro, Rosa | D | CT | U.S. House | 1991 – 2025 |
| | DeLay, Tom | R | TX | U.S. House | 1985 – 2006 |
| | DelBene, Suzan | D | WA | U.S. House | 2012 – 2025 |
| | Delgado, Antonio | D | NY | U.S. House | 2019 – 2022 |
| | Dellay, Vincent John | R | NJ | U.S. House | 1957 – 1959 |
| | Dellenback, John Richard | R | OR | U.S. House | 1967 – 1975 |
| | Dellums, Ronald V. | D | CA | U.S. House | 1971 – 1998 |
| | Deluzio, Chris | D | PA | U.S. House | 2023 – 2025 |
| | Demings, Val | D | FL | U.S. House | 2017 – 2023 |
| | DeMint, Jim | R | SC | U.S. Senate | 1999 – 2013 |
| | Dempsey, John Joseph | D | NM | U.S. House | 1951 – 1958 |
| | Denardis, Lawrence Joseph | R | CT | U.S. House | 1981 – 1983 |
| | Denham, Jeff | R | CA | U.S. House | 2011 – 2019 |
| | Denholm, Frank Edward | D | SD | U.S. House | 1971 – 1975 |
| | Denney, Robert Vernon | R | NE | U.S. House | 1967 – 1972 |
| | Dennis, David Worth | R | IN | U.S. House | 1969 – 1975 |
| | Dennison, David Short | R | OH | U.S. House | 1957 – 1959 |
| | Denny, Harmar Jr. | R | PA | U.S. House | 1951 – 1953 |
| | Dent, Charlie | R | PA | U.S. House | 2005 – 2018 |
| | Dent, John Herman | D | PA | U.S. House | 1958 – 1979 |
| | Denton, Jeremiah Andrew, Jr | R | AL | U.S. Senate | 1981 – 1987 |
| | Denton, Winfield Kirkpatrick | D | IN | U.S. House | 1949 – 1966 |
| | Derounian, Steven Boghos | R | NY | U.S. House | 1953 – 1965 |
| | Derrick, Butler Carson, Jr. | D | SC | U.S. House | 1975 – 1995 |
| | Derwinski, Edward Joseph | R | IL | U.S. House | 1959 – 1983 |
| | DeSantis, Ron | R | FL | U.S. House | 2013 – 2018 |
| | DeSaulnier, Mark | D | CA | U.S. House | 2015 – 2025 |
| | DesJarlais, Scott | R | TN | U.S. House | 2011 – 2025 |
| | Deutch, Ted | D | FL | U.S. House | 2010 – 2022 |
| | Deutsch, Peter | D | FL | U.S. House | 1993 – 2005 |
| | Devereux, James Patrick Sinnott | R | MD | U.S. House | 1951 – 1959 |
| | Devine, Samuel Leeper | R | OH | U.S. House | 1959 – 1981 |
| | Devitt, Edward James | R | MN | U.S. House | 1947 – 1949 |
| | DeWine, Mike | R | OH | U.S. Senate | 1983 – 2007 |
| | Diaz-Balart, Lincoln | R | FL | U.S. House | 1993 – 2011 |
| | Diaz-Balart, Mario | R | FL | U.S. House | 2003 – 2025 |
| | Dickey, Jay | R | AR | U.S. House | 1993 – 2001 |
| | Dickinson, William Louis | R | AL | U.S. House | 1965 – 1993 |
| | Dicks, Norm | D | WA | U.S. House | 1977 – 2013 |
| | Dickstein, Samuel | D | NY | U.S. House | 1945 – 1947 |
| | Dies, Martin, Jr. | D | TX | U.S. House | 1953 – 1959 |
| | Diggs, Charles Coles, Jr. | D | MI | U.S. House | 1955 – 1980 |
| | Dingell, Debbie | D | MI | U.S. House | 2015 – 2025 |
| | Dingell, John David | D | MI | U.S. House | 1933 – 1955 |
| | Dioguardi, Joseph J. | R | NY | U.S. House | 1985 – 1989 |
| | Dirksen, Everett McKinley | R | IL | U.S. Senate | 1933 – 1969 |
| | Dixon, Alan John | D | IL | U.S. Senate | 1981 – 1993 |
| | Dixon, Henry Aldous | R | UT | U.S. House | 1955 – 1961 |
| | Dixon, Julian Carey | D | CA | U.S. House | 1979 – 2000 |
| | Dodd, Christopher J. | D | CT | U.S. Senate | 1975 – 2011 |
| | Dodd, Thomas Joseph | D | CT | U.S. Senate | 1953 – 1971 |
| | Doggett, Lloyd | D | TX | U.S. House | 1995 – 2025 |
| | Dold, Robert J. | R | IL | U.S. House | 2011 – 2017 |
| | Dole, Elizabeth | R | NC | U.S. Senate | 2003 – 2009 |
| | Dole, Robert Joseph | R | KS | U.S. Senate | 1961 – 1996 |
| | Dollinger, Isidore | D | NY | U.S. House | 1949 – 1959 |
| | Dolliver, James Isaac | R | IA | U.S. House | 1945 – 1957 |
| | Domengeaux, James | D | LA | U.S. House | 1945 – 1949 |
| | Domenici, Pete V. | R | NM | U.S. Senate | 1973 – 2009 |
| | Dominick, Peter Hoyt | R | CO | U.S. Senate | 1961 – 1975 |
| | Donalds, Byron | R | FL | U.S. House | 2021 – 2025 |
| | Dondero, George Anthony | R | MI | U.S. House | 1945 – 1957 |
| | Donnell, Forrest C | R | MO | U.S. Senate | 1945 – 1951 |
| | Donnelly, Brian Joseph | D | MA | U.S. House | 1979 – 1993 |
| | Donnelly, Joe | D | IN | U.S. Senate | 2007 – 2019 |
| | Donohue, Harold Daniel | D | MA | U.S. House | 1947 – 1975 |
| | Donovan, Dan | R | NY | U.S. House | 2015 – 2019 |
| | Donovan, James George | D | NY | U.S. House | 1951 – 1957 |
| | Dooley, Cal | D | CA | U.S. House | 1991 – 2005 |
| | Dooley, Edwin Benedict | R | NY | U.S. House | 1957 – 1963 |
| | Doolittle, John T. | R | CA | U.S. House | 1991 – 2009 |
| | Dorgan, Byron L. | D | ND | U.S. Senate | 1981 – 2011 |
| | Dorn, Francis Edwin | R | NY | U.S. House | 1953 – 1961 |
| | Dorn, William Jennings Bryan | D | SC | U.S. House | 1947 – 1975 |
| | Dornan, Robert Kenneth | R | CA | U.S. House | 1977 – 1997 |
| | Dougherty, Charles Francis | R | PA | U.S. House | 1979 – 1983 |
| | Doughton, Robert Lee | D | NC | U.S. House | 1945 – 1953 |
| | Douglas, Charles Gywnne, III | R | NH | U.S. House | 1989 – 1991 |
| | Douglas, Emily Taft | D | IL | U.S. House | 1945 – 1947 |
| | Douglas, Helen Gahagan | D | CA | U.S. House | 1945 – 1951 |
| | Douglas, Paul Howard | D | IL | U.S. Senate | 1949 – 1967 |
| | Dow, John Goodchild | D | NY | U.S. House | 1965 – 1973 |
| | Dowdy, Charles Wayne | D | MS | U.S. House | 1981 – 1989 |
| | Dowdy, John Vernard | D | TX | U.S. House | 1953 – 1973 |
| | Downey, Sheridan | D | CA | U.S. Senate | 1945 – 1950 |
| | Downey, Thomas Joseph | D | NY | U.S. House | 1975 – 1993 |
| | Downing, Thomas Nelms | D | VA | U.S. House | 1959 – 1977 |
| | Doyle, Clyde Gilman | D | CA | U.S. House | 1945 – 1963 |
| | Doyle, Mike | D | PA | U.S. House | 1995 – 2022 |
| | Drake, Thelma | R | VA | U.S. House | 2005 – 2009 |
| | Dreier, David | R | CA | U.S. House | 1981 – 2013 |
| | Drewry, Patrick Henry | D | VA | U.S. House | 1945 – 1947 |
| | Driehaus, Steve | D | OH | U.S. House | 2009 – 2011 |
| | Drinan, Robert Frederick | D | MA | U.S. House | 1971 – 1981 |
| | Du Pont, Pierre Samuel, IV | R | DE | U.S. House | 1971 – 1977 |
| | Duarte, John | R | CA | U.S. House | 2023 – 2025 |
| | Duckworth, Tammy | D | IL | U.S. Senate | 2013 – 2029 |
| | Duff, James Henderson | R | PA | U.S. Senate | 1951 – 1957 |
| | Duffy, Sean P. | R | WI | U.S. House | 2011 – 2019 |
| | Dulles, John Foster | R | NY | U.S. Senate | 1949 – 1949 |
| | Dulski, Thaddeus Joseph | D | NY | U.S. House | 1959 – 1975 |
| | Duncan, Jeff | R | SC | U.S. House | 2011 – 2025 |
| | Duncan, John J. | R | TN | U.S. House | 1989 – 2019 |
| | Duncan, John James | R | TN | U.S. House | 1965 – 1988 |
| | Duncan, Robert Blackford | D | OR | U.S. House | 1963 – 1981 |
| | Dunn, James Whitney | R | MI | U.S. House | 1981 – 1983 |
| | Dunn, Jennifer | R | WA | U.S. House | 1993 – 2005 |
| | Dunn, Neal | R | FL | U.S. House | 2017 – 2025 |
| | Durbin, Richard | D | IL | U.S. Senate | 1983 – 2027 |
| | Durenberger, David Ferdinand | R | MN | U.S. Senate | 1979 – 1995 |
| | Durham, Carl Thomas | D | NC | U.S. House | 1945 – 1961 |
| | Durkin, John Anthony | D | NH | U.S. Senate | 1975 – 1980 |
| | Durno, Edwin Russell | R | OR | U.S. House | 1961 – 1963 |
| | Dworshak, Henry Clarence | R | ID | U.S. Senate | 1939 – 1962 |
| | Dwyer, Bernard James | D | NJ | U.S. House | 1981 – 1993 |
| | Dwyer, Florence Price | R | NJ | U.S. House | 1957 – 1973 |
| | Dyal, Kenneth Warren | D | CA | U.S. House | 1965 – 1967 |
| | Dymally, Mervyn Malcolm | D | CA | U.S. House | 1981 – 1993 |
| | Dyson, Royden Patrick | D | MD | U.S. House | 1981 – 1991 |