The 115th United States Congress began on January 3, 2017. There were seven new senators (five Democrats, two Republicans) and 52 new representatives (25 Democrats, 27 Republicans), as well as one new delegate (a Republican), at the start of its first session. Additionally, five senators (two Democrats, three Republicans) and 15 representatives (six Democrats, nine Republicans) took office on various dates in order to fill vacancies during the 115th Congress before it ended on January 3, 2019.

Due to court-ordered redistricting in three states, three representatives were elected from newly established congressional districts.

The co-presidents of the House Democratic freshman class were Nanette Barragán of California, Val Demings of Florida, and Donald McEachin of Virginia, while the president of the House Republican freshman class was Jack Bergman of Michigan. Additionally, the Democratic Freshmen Leadership Representative was Colleen Hanabusa of Hawaii (who was elected during the 114th Congress), and the Republican's freshmen liaison was Paul Mitchell of Michigan.

Senate Took office January 3, 2017 State Image Senator Seniority Switched party Prior background Birth year Ref California (D) (98th overall) No Attorney General of CaliforniaSan Francisco District Attorney 1964 Illinois (D) (96th overall) Yes U.S. House of RepresentativesAssistant Secretary of Veterans AffairsIllinois Director of Veterans' AffairsU.S. Army Lieutenant Colonel 1968 Indiana (R) (95th overall) No U.S. House of RepresentativesOrange County assistant deputy prosecutorU.S. Marine Corps Captain 1972 Louisiana (R) (99th overall) No Louisiana State TreasurerLouisiana Secretary of Revenue 1951 Maryland (D) (94th overall) No U.S. House of RepresentativesMaryland SenateMaryland House of Delegates 1959 Nevada (D) (100th overall) No Nevada Attorney General 1964 New Hampshire (D) (97th overall) Yes Governor of New HampshireMajority Leader of the New Hampshire Senate 1958

Took office during the 115th Congress State Image Senator Took office Switched party Prior background Birth year Ref Alabama (R) No Attorney General of Alabama 1953 Alabama (D) Yes U.S. Attorney for Northern AlabamaAssistant U.S. Attorney 1954 Minnesota (DFL) No Lieutenant Governor of MinnesotaChief of staff to Governor Mark DaytonChief of staff to Mayor R. T. Rybak 1958 Mississippi (R) No Mississippi Commissioner of Agriculture and CommerceMississippi State Senate 1959 Arizona (R) No U.S. SenateU.S. House of Representatives 1942

House of Representatives Took office January 3, 2017 District Image Representative Switched party Prior background Birth year Ref (D) No Arizona SenateArizona House of Representatives 1946 (R) No President of the Arizona SenateArizona House of Representatives 1958 (D) No Lawyer 1976 (D) No Monterey County deputy district attorneyU.S. Navy Reserve 1969 (D) No Santa Barbara County Board of SupervisorsU.S. Marine Corps Reserve 1964 (D) No Hermosa Beach City Council 1976 (D) No California State SenateOrange County Board of SupervisorsCalifornia State Assembly 1958 (D) No Delaware Secretary of LaborCEO of the Wilmington Urban League 1962 (R) No Florida House of Representatives 1982 (R) Yes SurgeonU.S. Army Major 1953 (R) No Sheriff of Jacksonville 1952 (D) No Minority Leader of the Florida SenateFlorida House of Representatives 1948 (D) Yes National security specialist 1978 (D) No Florida SenateFlorida House of Representatives 1978 (D) New seat Chief of the Orlando Police Department 1957 (D) Yes Governor of FloridaFlorida Attorney GeneralFlorida Education CommissionerFlorida Senate 1956 (R) Yes National Nuclear Security AdministrationU.S. Army EOD specialist 1980 (R) No U.S. Ambassador to the Holy See 1953 (R) No Mayor of West PointDentist 1966 (D) No Campaign stafferLawyer 1973 (D) Yes U.S. House of Representatives 1961 (R) No Indiana SenateU.S. Navy Reserve Lieutenant 1979 (R) No Entrepreneur 1983 (R) No ObstetricianU.S. Army Reserve Captain 1960 (R) No Lafayette City MarshalSt. Landry Sheriff's OfficeLouisiana National Guard Staff Sergeant 1961 (R) No Louisiana House of Representatives 1972 (D) No Lieutenant Governor of MarylandMaryland House of DelegatesU.S. Army Reserve Colonel 1961 (D) No Maryland Senate 1962 (R) No U.S. Marine Corps Lieutenant General 1947 (R) No St. Clair City CouncilOwner of Ross Medical Education Center 1956 (R) No Radio personality 1955 (R) Yes Assistant professor at Bellevue UniversityU.S. Air Force Brigadier General 1963 (D) Yes Computer software developer 1957 (D) Yes Nevada SenateNevada Assembly 1980 (D) Yes U.S. House of Representatives 1952 (D) Yes Counselor to FCC Chair Julius GenachowskiVice President of Burson Cohn & WolfeSpeechwriter for President Bill Clinton 1975 (D) No Nassau County ExecutiveMayor of Glen Cove 1962 (D) No New York State SenateNew York State Assembly 1954 (R) No Minority Leader of the New York State Assembly 1952 (R) No New York State Assembly 1961 (R) New seat Business owner 1971 (R) No Assistant U.S. AttorneyFederal Bureau of Investigation 1973 (R) No Pennsylvania State SenateWest Lampeter Township Board of Supervisors 1964 (R) No U.S. Attorney for Western Tennessee 1966 (D) No Lawyer 1967 (R) No Vice Chancellor of Texas Tech UniversityChief of staff to the Federal Deposit Insurance CorporationSpecial Assistant to President George W. Bush 1972 (R) No Virginia House of DelegatesU.S. Navy SEAL 1979 (D) New seat Virginia SenateVirginia House of Delegates 1961 (R) No Virginia SenateLouisa County Commonwealth's Attorney 1972 (D) No Washington State Senate 1965 (R) No Congressional stafferU.S. Marine Corps Captain 1984 (R) No Deputy Assistant Secretary of StateCo-chair of the Iran Syria Policy and Operations Group 1966

Non-voting members District Image Delegate Switched party Prior background Birth year Ref (NP/R) No/Yes Speaker of the Puerto Rico House of RepresentativesChair of the Republican Party of Puerto Rico 1976

Took office during the 115th Congress District Image Representative Took office Switched party Prior background Birth year Ref (R) No Kansas State TreasurerSedgwick County Treasurer 1956 (R) No Co-founder of RightNow TechnologiesElectrical engineer 1961 (R) No Georgia Secretary of StateFulton County Board of Commissioners 1962 (R) No South Carolina House of Representatives 1953 (D) No California State AssemblyLabor organizer 1974 (R) No Mayor of Provo 1960 (D) Yes Assistant U.S. AttorneyU.S. Marine Corps Major 1984 (R) No Arizona SenateArizona House of Representatives 1958 (R) No Business owner 1975 (R) No Ohio SenateOhio House of Representatives 1962 (D) No Majority Leader of the New York State AssemblyMonroe County Legislature 1957 (R) No Businessman 1961 (D) Yes Wallingford-Swarthmore School Board 1959 (D) Yes Solicitor of Allentown 1957 (D) No President of the Detroit City Council 1959

See also List of United States representatives in the 115th Congress List of United States senators in the 115th Congress

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