The 98th United States Congress began on January 3, 1983. There were four new senators (one Democrat, three Republicans) and 79 new representatives (56 Democrats, 23 Republicans) at the start of the first session. Additionally, two senators (one Democrat, one Republican) and nine representatives (six Democrats, three Republicans) took office on various dates in order to fill vacancies during the 98th Congress before it ended on January 3, 1985.

Due to redistricting after the 1980 census, 20 representatives were elected from newly established congressional districts. One representative-elect, Jack Swigert, died before taking office.

Senate Took office January 3, 1983 State Image Senator Seniority Switched party Prior background Birth year Ref California (R) (98th overall) No Mayor of San DiegoCalifornia State AssemblyU.S. Marine Corps First Lieutenant 1933 Nevada (R) (100th overall) Yes Nevada Senate 1928 New Mexico (D) (99th overall) Yes Attorney General of New MexicoU.S. Army Reserve 1943 Virginia (R) (97th overall) Yes U.S. House of RepresentativesEssex County Commonwealth's Attorney 1946

Took office during the 98th Congress State Image Senator Took office Switched party Prior background Birth year Ref Washington (R) Yes President of Evergreen State CollegeGovernor of WashingtonWashington House of RepresentativesU.S. Navy Ensign 1925 Massachusetts (D) No Lieutenant Governor of MassachusettsU.S. Navy Lieutenant 1943

House of Representatives Took office January 3, 1983 District Representative Switched party Prior background Birth year Ref (D) No County Commissioner 1938 (R) No U.S. Navy Captain 1936 (D) New seat State Senator 1925 (D) Yes State Assemblyman 1946 (D) No County Supervisor 1940 (R) No Educator 1940 (D) New seat State Assemblyman 1948 (D) New seat State Assemblyman 1941 (D) Yes State Assemblyman 1943 (D) New seat U.S. Ambassador to UNESCO 1930 (R) New seat County Supervisor 1927 (R) No Mayor of Carlsbad 1931 (D) New seat County Supervisor 1941 (D) Yes Lawyer 1944 (R) Yes State Senator 1935 (D) Yes Delaware State Treasurer 1947 (D) New seat State Senator 1933 (R) New seat Lawyer 1930 (R) No State Senator 1924 (R) New seat Businessman 1940 (D) New seat State Representative 1941 (D) No Investment banker 1943 (D) No Mayor of Perry 1927 (D) No State Representative 1926 (D) No City Alderman 1937 (D) Yes Attorney 1951 (D) Yes Lawyer 1944 (R) New seat State Senator 1938 (D) Yes Mayor of Bloomington 1939 (D) Yes State Representative 1948 (R) No State Representative 1948 (D) Yes U.S. Representative 1943 (D) No State Senator 1931 (DFL) Yes State Senator 1951 (DFL) Yes State Senator 1948 (R) Yes Judicial Court Judge 1941 (D) No State Representative 1951 (D) New seat Lieutenant Governor of Nevada 1939 (R) Yes Congressional staffer 1921 (D) Yes Attorney 1951 (D) New seat Congressional staffer 1947 (D) Yes County Legislator 1945 (D) No Professor 1934 (D) No State Senator 1936 (R) No County Executive 1936 (D) No State Representative 1926 (D) Yes Lawyer 1942 (D) Yes State Senator 1917 (R) No State Senator 1947 (D) Yes Urban planner 1946 (R) Yes State Senator 1952 (D) No County Commissioner 1947 (R) New seat State House Speaker 1931 (D) Yes State Representative 1948 (D) Yes State Representative 1926 (D) Yes U.S. Representative 1946 (D) Yes Professor 1940 (R) Yes State Senator 1930 (R) No District Attorney 1945 (D) No Attorney 1942 (D) Yes State Representative 1946 (D) New seat Lawyer 1954 (R) No County Party Chair 1936 (R) No Party official 1947 (D) No State Representative 1947 (D) No State Representative 1941 (D) New seat Attorney 1944 (D) New seat Mayor of Arlington 1926 (D) New seat County Sheriff 1937 (R) New seat State House Speaker 1924 (R) No State Senator 1928 (D) Yes State Delegate 1927 (D) Yes Vice President of General Electric 1920 (D) Yes State Senator 1946 (R) New seat State Representative 1942 (D) No U.S. Army Reserve Captain 1943 (D) Yes State Senator 1951 (D) Yes State Senator 1948 (D) No State Senator 1935

Took office during the 98th Congress District Representative Took office Switched party Prior background Birth year Ref (R) Yes U.S. Representative 1942 (D) No State Senator 1942 (R) New seat/No State Senator 1936 (D) No Activist 1925 (D) No Civil rights leader 1918 (D) No State Representative 1943 (D) No State Senator 1943 (D) No State Representative 1954 (R) No State Senator 1943

See also List of United States representatives in the 98th Congress List of United States senators in the 98th Congress

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