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|  | Sabath, Adolph Joachim | D | IL | U.S. House | 1945 – 1953 |
| | Sabo, Martin Olav | D | MN | U.S. House | 1979 – 2007 |
| | Sadlak, Antoni Nicholas | R | CT | U.S. House | 1947 – 1959 |
| | Sadowski, George Gregory | D | MI | U.S. House | 1945 – 1952 |
| | Saiki, Patricia Fukuda | R | HI | U.S. House | 1987 – 1991 |
| | Salazar, John | D | CO | U.S. House | 2005 – 2011 |
| | Salazar, Ken | D | CO | U.S. Senate | 2005 – 2009 |
| | Salazar, Maria Elvira | R | FL | U.S. House | 2021 – 2025 |
| | Sali, Bill | R | ID | U.S. House | 2007 – 2009 |
| | Salinas, Andrea | D | OR | U.S. House | 2023 – 2025 |
| | Salinger, Pierre Emil George | D | CA | U.S. Senate | 1964 – 1964 |
| | Salmon, Matt | R | AZ | U.S. House | 1995 – 2017 |
| | Saltonstall, Leverett | R | MA | U.S. Senate | 1945 – 1967 |
| | Sanborn, John Carfield | R | ID | U.S. House | 1947 – 1952 |
| | Sanchez, Linda | D | CA | U.S. House | 2003 – 2025 |
| | Sanchez, Loretta | D | CA | U.S. House | 1997 – 2017 |
| | Sanders, Bernie | I | VT | U.S. Senate | 1991 – 2025 |
| | Sandlin, Max | D | TX | U.S. House | 1997 – 2005 |
| | Sandman, Charles William, Jr. | R | NJ | U.S. House | 1967 – 1975 |
| | Sanford, (James) Terry | D | NC | U.S. Senate | 1987 – 1993 |
| | Sanford, Mark | R | SC | U.S. House | 1995 – 2019 |
| | Sangmeister, George Edward | D | IL | U.S. House | 1989 – 1995 |
| | Santangelo, Alfred Edward | D | NY | U.S. House | 1957 – 1963 |
| | Santini, James David | D | NV | U.S. House | 1975 – 1983 |
| | Santorum, Rick | R | PA | U.S. Senate | 1991 – 2007 |
| | Santos, George | R | NY | U.S. House | 2023 – 2023 |
| | Sarasin, Ronald Arthur | R | CT | U.S. House | 1973 – 1979 |
| | Sarbacher, George William, Jr. | R | PA | U.S. House | 1947 – 1949 |
| | Sarbanes, John | D | MD | U.S. House | 2007 – 2025 |
| | Sarbanes, Paul S. | D | MD | U.S. Senate | 1971 – 2007 |
| | Sarpalius, William | D | TX | U.S. House | 1989 – 1995 |
| | Sasscer, Lansdale Ghiselin | D | MD | U.S. House | 1945 – 1953 |
| | Sasse, Ben | R | NE | U.S. Senate | 2015 – 2023 |
| | Sasser, James Ralph | D | TN | U.S. Senate | 1977 – 1995 |
| | Satterfield, Dave Edward, Jr. | D | VA | U.S. House | 1937 – 1945 |
| | Satterfield, David Edward, III | D | VA | U.S. House | 1965 – 1981 |
| | Saund, Dalip Singh | D | CA | U.S. House | 1957 – 1963 |
| | Savage, Charles Raymon | D | WA | U.S. House | 1945 – 1947 |
| | Savage, Gus | D | IL | U.S. House | 1981 – 1993 |
| | Sawyer, Harold Samuel | R | MI | U.S. House | 1977 – 1985 |
| | Sawyer, Thomas C. | D | OH | U.S. House | 1987 – 2003 |
| | Saxbe, William Bart | R | OH | U.S. Senate | 1969 – 1975 |
| | Saxton, H. James | R | NJ | U.S. House | 1985 – 2009 |
| | Saylor, John Phillips | R | PA | U.S. House | 1949 – 1973 |
| | Scalise, Steve | R | LA | U.S. House | 2008 – 2025 |
| | Scanlon, Mary Gay | D | PA | U.S. House | 2018 – 2025 |
| | Scarborough, Charles | R | FL | U.S. House | 1995 – 2001 |
| | Schadeberg, Henry Carl | R | WI | U.S. House | 1961 – 1971 |
| | Schaefer, Dan L. | R | CO | U.S. House | 1983 – 1999 |
| | Schaffer, Robert W. | R | CO | U.S. House | 1997 – 2003 |
| | Schakowsky, Jan | D | IL | U.S. House | 1999 – 2025 |
| | Schatz, Brian | D | HI | U.S. Senate | 2012 – 2029 |
| | Schauer, Mark | D | MI | U.S. House | 2009 – 2011 |
| | Schenck, Paul Fornshell | R | OH | U.S. House | 1951 – 1965 |
| | Schenk, Lynn | D | CA | U.S. House | 1993 – 1995 |
| | Scherer, Gordon Harry | R | OH | U.S. House | 1953 – 1963 |
| | Scherle, William Joseph | R | IA | U.S. House | 1967 – 1975 |
| | Scheuer, James Haas | D | NY | U.S. House | 1965 – 1993 |
| | Schiff, Adam | D | CA | U.S. House | 2001 – 2025 |
| | Schiff, Steven H. | R | NM | U.S. House | 1989 – 1998 |
| | Schilling, Bobby | R | IL | U.S. House | 2011 – 2013 |
| | Schisler, Darwin Gale | D | IL | U.S. House | 1965 – 1967 |
| | Schmidhauser, John Richard | D | IA | U.S. House | 1965 – 1967 |
| | Schmidt, Jean | R | OH | U.S. House | 2005 – 2013 |
| | Schmitt, Eric | R | MO | U.S. Senate | 2023 – 2029 |
| | Schmitt, Harrison Hagan | R | NM | U.S. Senate | 1977 – 1983 |
| | Schmitz, John George | R | CA | U.S. House | 1970 – 1973 |
| | Schneebeli, Herman Theodore | R | PA | U.S. House | 1960 – 1977 |
| | Schneider, Brad | D | IL | U.S. House | 2013 – 2025 |
| | Schneider, Claudine | R | RI | U.S. House | 1981 – 1991 |
| | Schock, Aaron | R | IL | U.S. House | 2009 – 2015 |
| | Schoeppel, Andrew Frank | R | KS | U.S. Senate | 1949 – 1962 |
| | Scholten, Hillary | D | MI | U.S. House | 2023 – 2025 |
| | Schrader, Kurt | D | OR | U.S. House | 2009 – 2023 |
| | Schrier, Kim | D | WA | U.S. House | 2019 – 2025 |
| | Schrock, Ed | R | VA | U.S. House | 2001 – 2005 |
| | Schroeder, Patricia Scott | D | CO | U.S. House | 1973 – 1997 |
| | Schuette, Bill | R | MI | U.S. House | 1985 – 1991 |
| | Schulze, Richard Taylor | R | PA | U.S. House | 1975 – 1993 |
| | Schumer, Charles | D | NY | U.S. Senate | 1981 – 2029 |
| | Schwabe, George Blaine | R | OK | U.S. House | 1945 – 1953 |
| | Schwabe, Max | R | MO | U.S. House | 1945 – 1949 |
| | Schwartz, Allyson Y. | D | PA | U.S. House | 2005 – 2015 |
| | Schwarz, Joe | R | MI | U.S. House | 2005 – 2007 |
| | Schweiker, Richard Schultz | R | PA | U.S. Senate | 1961 – 1981 |
| | Schweikert, David | R | AZ | U.S. House | 2011 – 2025 |
| | Schwengel, Frederick Delbert | R | IA | U.S. House | 1955 – 1973 |
| | Scoblick, James Paul | R | PA | U.S. House | 1947 – 1949 |
| | Scott, Austin | R | GA | U.S. House | 2011 – 2025 |
| | Scott, David | D | GA | U.S. House | 2003 – 2025 |
| | Scott, Hardie | R | PA | U.S. House | 1947 – 1953 |
| | Scott, Hugh Doggett, Jr. | R | PA | U.S. Senate | 1947 – 1977 |
| | Scott, Ralph James | D | NC | U.S. House | 1957 – 1967 |
| | Scott, Rick | R | FL | U.S. Senate | 2019 – 2025 |
| | Scott, Robert | D | VA | U.S. House | 1993 – 2025 |
| | Scott, Tim | R | SC | U.S. Senate | 2011 – 2029 |
| | Scott, William Kerr | D | NC | U.S. Senate | 1954 – 1958 |
| | Scott, William Lloyd | R | VA | U.S. Senate | 1967 – 1979 |
| | Scranton, William Warren | R | PA | U.S. House | 1961 – 1963 |
| | Scrivner, Errett Power | R | KS | U.S. House | 1945 – 1959 |
| | Scrugham, James Graves | D | NV | U.S. Senate | 1942 – 1945 |
| | Scudder, Hubert Baxter | R | CA | U.S. House | 1949 – 1959 |
| | Seastrand, Andrea | R | CA | U.S. House | 1995 – 1997 |
| | Seaton, Frederick Andrew | R | NE | U.S. Senate | 1951 – 1952 |
| | Sebelius, Keith George | R | KS | U.S. House | 1969 – 1981 |
| | Secrest, Robert Thompson | D | OH | U.S. House | 1933 – 1966 |
| | Seely-Brown, Horace, Jr. | R | CT | U.S. House | 1947 – 1963 |
| | Seiberling, John Frederick | D | OH | U.S. House | 1971 – 1987 |
| | Sekula-Gibbs, Shelley | R | TX | U.S. House | 2006 – 2007 |
| | Selden, Armistead Inge, Jr. | D | AL | U.S. House | 1953 – 1969 |
| | Self, Keith | R | TX | U.S. House | 2023 – 2025 |
| | Sempolinski, Joe | R | NY | U.S. House | 2022 – 2023 |
| | Senner, George Frederick, Jr. | D | AZ | U.S. House | 1963 – 1967 |
| | Sensenbrenner, Jim | R | WI | U.S. House | 1979 – 2021 |
| | Serrano, José E. | D | NY | U.S. House | 1990 – 2021 |
| | Sessions, Jeff | R | AL | U.S. Senate | 1997 – 2017 |
| | Sessions, Pete | R | TX | U.S. House | 1997 – 2025 |
| | Sestak, Joe | D | PA | U.S. House | 2007 – 2011 |
| | Sewell, Terri | D | AL | U.S. House | 2011 – 2025 |
| | Seymour, John | R | CA | U.S. Senate | 1991 – 1992 |
| | Shadegg, John | R | AZ | U.S. House | 1995 – 2011 |
| | Shafer, Paul Werntz | R | MI | U.S. House | 1945 – 1954 |
| | Shaheen, Jeanne | D | NH | U.S. Senate | 2009 – 2027 |
| | Shamansky, Robert Norton | D | OH | U.S. House | 1981 – 1983 |
| | Shannon, James Michael | D | MA | U.S. House | 1979 – 1985 |
| | Sharp, Edgar Allan | R | NY | U.S. House | 1945 – 1947 |
| | Sharp, Philip Riley | D | IN | U.S. House | 1975 – 1995 |
| | Shaw, E. Clay Jr. | R | FL | U.S. House | 1981 – 2007 |
| | Shays, Christopher | R | CT | U.S. House | 1987 – 2009 |
| | Shea-Porter, Carol | D | NH | U.S. House | 2007 – 2019 |
| | Sheehan, Timothy Patrick | R | IL | U.S. House | 1951 – 1959 |
| | Shelby, Richard | R | AL | U.S. Senate | 1979 – 2023 |
| | Shelley, John Francis | D | CA | U.S. House | 1950 – 1964 |
| | Shepherd, Karen | D | UT | U.S. House | 1993 – 1995 |
| | Sheppard, Harry Richard | D | CA | U.S. House | 1945 – 1965 |
| | Sheridan, John Edward | D | PA | U.S. House | 1945 – 1947 |
| | Sherman, Brad | D | CA | U.S. House | 1997 – 2025 |
| | Sherrill, Mikie | D | NJ | U.S. House | 2019 – 2025 |
| | Sherwood, Don | R | PA | U.S. House | 1999 – 2007 |
| | Shimkus, John | R | IL | U.S. House | 1997 – 2021 |
| | Shipley, George Edward | D | IL | U.S. House | 1959 – 1979 |
| | Shipstead, Henrik | R | MN | U.S. Senate | 1945 – 1947 |
| | Short, Dewey Jackson | R | MO | U.S. House | 1945 – 1957 |
| | Short, Don Levingston | R | ND | U.S. House | 1959 – 1965 |
| | Shoup, Richard Gardner | R | MT | U.S. House | 1971 – 1975 |
| | Shows, Clifford | D | MS | U.S. House | 1999 – 2003 |
| | Shriver, Garner E. | R | KS | U.S. House | 1961 – 1977 |
| | Shuford, George Adams | D | NC | U.S. House | 1953 – 1959 |
| | Shuler, Heath | D | NC | U.S. House | 2007 – 2013 |
| | Shumway, Norman David | R | CA | U.S. House | 1979 – 1991 |
| | Shuster, Bill | R | PA | U.S. House | 2001 – 2019 |
| | Shuster, E. G. | R | PA | U.S. House | 1973 – 2001 |
| | Sibal, Abner Woodruff | R | CT | U.S. House | 1961 – 1965 |
| | Sickles, Carlton Ralph | D | MD | U.S. House | 1963 – 1967 |
| | Sieminski, Alfred Dennis | D | NJ | U.S. House | 1951 – 1959 |
| | Sikes, Robert Lee Fulton | D | FL | U.S. House | 1941 – 1979 |
| | Sikorski, Gerald Edward | D | MN | U.S. House | 1983 – 1993 |
| | Siler, Eugene | R | KY | U.S. House | 1955 – 1965 |
| | Siljander, Mark Deli | R | MI | U.S. House | 1981 – 1987 |
| | Simmons, Rob | R | CT | U.S. House | 2001 – 2007 |
| | Simon, Paul Martin | D | IL | U.S. Senate | 1975 – 1997 |
| | Simpson, Alan Kooi | R | WY | U.S. Senate | 1979 – 1997 |
| | Simpson, Edna Oakes | R | IL | U.S. House | 1959 – 1961 |
| | Simpson, Mike | R | ID | U.S. House | 1999 – 2025 |
| | Simpson, Milward Lee | R | WY | U.S. Senate | 1962 – 1967 |
| | Simpson, Richard Murray | R | PA | U.S. House | 1945 – 1960 |
| | Simpson, Sidney Elmer | R | IL | U.S. House | 1945 – 1958 |
| | Sims, Hugo Sheridan, Jr. | D | SC | U.S. House | 1949 – 1952 |
| | Sinema, Kyrsten | I | AZ | U.S. Senate | 2013 – 2025 |
| | Sires, Albio | D | NJ | U.S. House | 2006 – 2023 |
| | Sisisky, Norman | D | VA | U.S. House | 1983 – 2001 |
| | Sisk, Bernice Frederic | D | CA | U.S. House | 1955 – 1979 |
| | Sittler, Edward Lewis, Jr. | R | PA | U.S. House | 1951 – 1953 |
| | Skaggs, David E. | D | CO | U.S. House | 1987 – 1999 |
| | Skeen, Joseph Richard | R | NM | U.S. House | 1981 – 2003 |
| | Skelton, Ike | D | MO | U.S. House | 1977 – 2011 |
| | Skubitz, Joe | R | KS | U.S. House | 1963 – 1979 |
| | Slack, John Mark, Jr. | D | WV | U.S. House | 1959 – 1981 |
| | Slattery, James Charles | D | KS | U.S. House | 1983 – 1995 |
| | Slaughter, Daniel French, Jr. | R | VA | U.S. House | 1985 – 1991 |
| | Slaughter, Louise M. | D | NY | U.S. House | 1987 – 2018 |
| | Slaughter, Roger Caldwell | D | MO | U.S. House | 1945 – 1947 |
| | Slotkin, Elissa | D | MI | U.S. House | 2019 – 2025 |
| | Small, Frank, Jr. | R | MD | U.S. House | 1953 – 1955 |
| | Smathers, George Armistead | D | FL | U.S. Senate | 1947 – 1969 |
| | Smith, Adam | D | WA | U.S. House | 1997 – 2025 |
| | Smith, Adrian | R | NE | U.S. House | 2007 – 2025 |
| | Smith, Albert Lee, Jr. | R | AL | U.S. House | 1981 – 1983 |
| | Smith, Benjamin A., II | D | MA | U.S. Senate | 1960 – 1962 |
| | Smith, Christopher | R | NJ | U.S. House | 1981 – 2025 |
| | Smith, Dennis Alan (Denny) | R | OR | U.S. House | 1981 – 1991 |
| | Smith, Frank Ellis | D | MS | U.S. House | 1951 – 1962 |
| | Smith, Frederick Cleveland | R | OH | U.S. House | 1945 – 1952 |
| | Smith, Gordon H. | R | OR | U.S. Senate | 1997 – 2009 |
| | Smith, H. Allen | R | CA | U.S. House | 1957 – 1973 |
| | Smith, Henry P., III | R | NY | U.S. House | 1965 – 1975 |
| | Smith, Howard Alexander | R | NJ | U.S. Senate | 1945 – 1959 |
| | Smith, Howard Worth | D | VA | U.S. House | 1945 – 1967 |
| | Smith, James Vernon | R | OK | U.S. House | 1967 – 1969 |
| | Smith, Jason | R | MO | U.S. House | 2013 – 2025 |
| | Smith, Joseph Francis | D | PA | U.S. House | 1981 – 1983 |
| | Smith, Lamar | R | TX | U.S. House | 1987 – 2019 |
| | Smith, Larkin I. | R | MS | U.S. House | 1989 – 1989 |
| | Smith, Lawrence Henry | R | WI | U.S. House | 1945 – 1959 |
| | Smith, Lawrence Jack | D | FL | U.S. House | 1983 – 1993 |
| | Smith, Linda | R | WA | U.S. House | 1995 – 1999 |
| | Smith, Margaret Chase | R | ME | U.S. Senate | 1940 – 1973 |
| | Smith, Neal Edward | D | IA | U.S. House | 1959 – 1995 |
| | Smith, Nick | R | MI | U.S. House | 1993 – 2005 |
| | Smith, Peter P. | R | VT | U.S. House | 1989 – 1991 |
| | Smith, Ralph Tyler | R | IL | U.S. Senate | 1969 – 1970 |
| | Smith, Robert C. | R | NH | U.S. Senate | 1985 – 2003 |
| | Smith, Robert Freeman | R | OR | U.S. House | 1983 – 1999 |
| | Smith, Tina | D | MN | U.S. Senate | 2018 – 2027 |
| | Smith, Virginia Dodd | R | NE | U.S. House | 1975 – 1991 |
| | Smith, Willis | D | NC | U.S. Senate | 1950 – 1953 |
| | Smith, Wint | R | KS | U.S. House | 1947 – 1961 |
| | Smucker, Lloyd | R | PA | U.S. House | 2017 – 2025 |
| | Snowbarger, Vince | R | KS | U.S. House | 1997 – 1999 |
| | Snowe, Olympia J. | R | ME | U.S. Senate | 1979 – 2013 |
| | Snyder, John Buell | D | PA | U.S. House | 1945 – 1946 |
| | Snyder, Marion Gene | R | KY | U.S. House | 1963 – 1987 |
| | Snyder, Melvin Claude | R | WV | U.S. House | 1947 – 1949 |
| | Snyder, Vic | D | AR | U.S. House | 1997 – 2011 |
| | Sodrel, Mike | R | IN | U.S. House | 2005 – 2007 |
| | Solarz, Stephen Joshua | D | NY | U.S. House | 1975 – 1993 |
| | Solis, Hilda L. | D | CA | U.S. House | 2001 – 2009 |
| | Solomon, Gerald B. H. | R | NY | U.S. House | 1979 – 1999 |
| | Somers, Andrew Lawrence | D | NY | U.S. House | 1925 – 1949 |
| | Sorensen, Eric | D | IL | U.S. House | 2023 – 2025 |
| | Soto, Darren | D | FL | U.S. House | 2017 – 2025 |
| | Souder, Mark | R | IN | U.S. House | 1995 – 2010 |
| | Southerland, Steve II | R | FL | U.S. House | 2011 – 2015 |
| | Space, Zack | D | OH | U.S. House | 2007 – 2011 |
| | Spanberger, Abigail | D | VA | U.S. House | 2019 – 2025 |
| | Spano, Ross | R | FL | U.S. House | 2019 – 2021 |
| | Sparkman, John Jackson | D | AL | U.S. Senate | 1937 – 1979 |
| | Spartz, Victoria | R | IN | U.S. House | 2021 – 2025 |
| | Specter, Arlen | R | PA | U.S. Senate | 1981 – 2011 |
| | Speier, Jackie | D | CA | U.S. House | 2008 – 2023 |
| | Spellman, Gladys Noon | D | MD | U.S. House | 1975 – 1981 |
| | Spence, Brent | D | KY | U.S. House | 1945 – 1963 |
| | Spence, Floyd Davidson | R | SC | U.S. House | 1971 – 2001 |
| | Spong, William Belser, Jr. | D | VA | U.S. Senate | 1967 – 1973 |
| | Spratt, John M. Jr. | D | SC | U.S. House | 1983 – 2011 |
| | Springer, Raymond Smiley | R | IN | U.S. House | 1939 – 1947 |
| | Springer, William Lee | R | IL | U.S. House | 1951 – 1973 |
| | St Germain, Fernand Joseph | D | RI | U.S. House | 1961 – 1989 |
| | St. George, Katharine Price Collier | R | NY | U.S. House | 1947 – 1965 |
| | St. Onge, William Leon | D | CT | U.S. House | 1963 – 1970 |
| | Stabenow, Debbie | D | MI | U.S. Senate | 1997 – 2025 |
| | Stack, Edward John | D | FL | U.S. House | 1979 – 1981 |
| | Staebler, Neil Oliver | D | MI | U.S. House | 1963 – 1965 |
| | Stafford, Robert Theodore | R | VT | U.S. Senate | 1961 – 1989 |
| | Staggers, Harley Orrin, Jr. | D | WV | U.S. House | 1983 – 1993 |
| | Staggers, Harley Orrin | D | WV | U.S. House | 1949 – 1981 |
| | Stalbaum, Lynn Ellsworth | D | WI | U.S. House | 1965 – 1967 |
| | Stallings, Richard Howard | D | ID | U.S. House | 1985 – 1993 |
| | Stanfill, William Abner | R | KY | U.S. Senate | 1945 – 1947 |
| | Stangeland, Arlan Ingehart | R | MN | U.S. House | 1977 – 1991 |
| | Stanley, Thomas Bahnson | D | VA | U.S. House | 1946 – 1953 |
| | Stansbury, Melanie | D | NM | U.S. House | 2021 – 2025 |
| | Stanton, Greg | D | AZ | U.S. House | 2019 – 2025 |
| | Stanton, James Vincent | D | OH | U.S. House | 1971 – 1977 |
| | Stanton, John William | R | OH | U.S. House | 1965 – 1983 |
| | Stark, Pete | D | CA | U.S. House | 1973 – 2013 |
| | Starkey, Frank Thomas | D | MN | U.S. House | 1945 – 1947 |
| | Staton, David Michael | R | WV | U.S. House | 1981 – 1983 |
| | Stauber, Pete | R | MN | U.S. House | 2019 – 2025 |
| | Stauffer, Simon Walter | R | PA | U.S. House | 1953 – 1959 |
| | Stearns, Cliff | R | FL | U.S. House | 1989 – 2013 |
| | Steed, Thomas Jefferson | D | OK | U.S. House | 1949 – 1981 |
| | Steel, Michelle | R | CA | U.S. House | 2021 – 2025 |
| | Steele, Robert Hampton | R | CT | U.S. House | 1970 – 1975 |
| | Steelman, Alan Watson | R | TX | U.S. House | 1973 – 1977 |
| | Steers, Newton Ivan, Jr. | R | MD | U.S. House | 1977 – 1979 |
| | Stefan, Karl | R | NE | U.S. House | 1945 – 1953 |
| | Stefanik, Elise | R | NY | U.S. House | 2015 – 2025 |
| | Steiger, Sam | R | AZ | U.S. House | 1967 – 1977 |
| | Steiger, William Albert | R | WI | U.S. House | 1967 – 1981 |
| | Steil, Bryan | R | WI | U.S. House | 2019 – 2025 |
| | Stenholm, Charles W. | D | TX | U.S. House | 1979 – 2005 |
| | Stennis, John Cornelius | D | MS | U.S. Senate | 1947 – 1989 |
| | Stephens, Robert Grier, Jr. | D | GA | U.S. House | 1961 – 1977 |
| | Steube, Greg | R | FL | U.S. House | 2019 – 2025 |
| | Stevens, Haley | D | MI | U.S. House | 2019 – 2025 |
| | Stevens, Ted | R | AK | U.S. Senate | 1968 – 2009 |
| | Stevenson, Adlai Ewing, III | D | IL | U.S. Senate | 1970 – 1981 |
| | Stevenson, William Henry | R | WI | U.S. House | 1945 – 1949 |
| | Stewart, Arthur Thomas (Tom) | D | TN | U.S. Senate | 1943 – 1949 |
| | Stewart, Bennett McVey | D | IL | U.S. House | 1979 – 1981 |
| | Stewart, Chris | R | UT | U.S. House | 2013 – 2025 |
| | Stewart, Donald Wilbur | D | AL | U.S. Senate | 1978 – 1981 |
| | Stewart, Paul | D | OK | U.S. House | 1945 – 1947 |
| | Stigler, William Grady | D | OK | U.S. House | 1945 – 1953 |
| | Stinson, K. William | R | WA | U.S. House | 1963 – 1965 |
| | Stivers, Steve | R | OH | U.S. House | 2011 – 2021 |
| | Stockman, David Alan | R | MI | U.S. House | 1977 – 1981 |
| | Stockman, Lowell | R | OR | U.S. House | 1945 – 1953 |
| | Stockman, Steve | R | TX | U.S. House | 1995 – 2015 |
| | Stokes, Louis | D | OH | U.S. House | 1969 – 1999 |
| | Stone, Richard Bernard | D | FL | U.S. Senate | 1975 – 1981 |
| | Strang, Michael Lathrop | R | CO | U.S. House | 1985 – 1987 |
| | Strange, Luther | R | AL | U.S. Senate | 2017 – 2018 |
| | Stratton, Samuel Studdiford | D | NY | U.S. House | 1959 – 1989 |
| | Stratton, William Grant | R | IL | U.S. House | 1947 – 1949 |
| | Strickland, Marilyn | D | WA | U.S. House | 2021 – 2025 |
| | Strickland, Ted | D | OH | U.S. House | 1993 – 2007 |
| | Stringfellow, Douglas R. | R | UT | U.S. House | 1953 – 1955 |
| | Strong, Dale | R | AL | U.S. House | 2023 – 2025 |
| | Stubblefield, Frank Albert | D | KY | U.S. House | 1959 – 1975 |
| | Stuckey, Williamson Sylvester, Jr. | D | GA | U.S. House | 1967 – 1977 |
| | Studds, Gerry Eastman | D | MA | U.S. House | 1973 – 1997 |
| | Stump, Robert Lee | R | AZ | U.S. House | 1977 – 2003 |
| | Stupak, Bart | D | MI | U.S. House | 1993 – 2011 |
| | Stutzman, Marlin | R | IN | U.S. House | 2010 – 2017 |
| | Sullivan, Dan | R | AK | U.S. Senate | 2015 – 2027 |
| | Sullivan, John Berchmans | D | MO | U.S. House | 1941 – 1951 |
| | Sullivan, John | R | OK | U.S. House | 2002 – 2013 |
| | Sullivan, Leonor Kretzer | D | MO | U.S. House | 1953 – 1977 |
| | Sumner, Jessie | R | IL | U.S. House | 1945 – 1947 |
| | Sumners, Hatton William | D | TX | U.S. House | 1945 – 1947 |
| | Sundquist, Donald Kenneth | R | TN | U.S. House | 1983 – 1995 |
| | Sundstrom, Frank Leander | R | NJ | U.S. House | 1945 – 1949 |
| | Sununu, John E. | R | NH | U.S. Senate | 1997 – 2009 |
| | Suozzi, Tom | D | NY | U.S. House | 2017 – 2025 |
| | Sutton, Betty | D | OH | U.S. House | 2007 – 2013 |
| | Sutton, James Patrick | D | TN | U.S. House | 1949 – 1955 |
| | Swalwell, Eric | D | CA | U.S. House | 2013 – 2025 |
| | Sweeney, David McCann (Mac) | R | TX | U.S. House | 1985 – 1989 |
| | Sweeney, John E. | R | NY | U.S. House | 1999 – 2007 |
| | Sweeney, Robert E. | D | OH | U.S. House | 1965 – 1967 |
| | Swett, Richard | D | NH | U.S. House | 1991 – 1995 |
| | Swift, Allan Byron | D | WA | U.S. House | 1979 – 1995 |
| | Swift, George Robinson | D | AL | U.S. Senate | 1946 – 1946 |
| | Swindall, Patrick Lynn | R | GA | U.S. House | 1985 – 1989 |
| | Sykes, Emilia | D | OH | U.S. House | 2023 – 2025 |
| | Symington, James Wadsworth | D | MO | U.S. House | 1969 – 1977 |
| | Symington, William Stuart (Stuart) | D | MO | U.S. Senate | 1953 – 1977 |
| | Symms, Steven Douglas | R | ID | U.S. Senate | 1973 – 1993 |
| | Synar, Michael Lynn | D | OK | U.S. House | 1979 – 1995 |