Question: how many senators are there in united states
Answer: ited States Congress Type Type Bicameral Houses Senate House of Representatives History Founded March 4 , 1789 ( 228 years ago ) ( 1789 - 03 - 04 ) Preceded by Congress of the Confederation New session started January 3 , 2017 Leadership President of the Senate & Vice President Mike Pence ( R ) Since January 20 , 2017 Speaker of the House of Representatives Paul Ryan ( R ) Since October 29 , 2015 President pro tempore of the Senate Orrin Hatch ( R ) Since January 6 , 2015 Structure Seats 535 voting members 100 senators 435 representatives 6 non-voting members Senate political groups Republican ( 51 ) Democratic ( 47 ) Independent ( 2 ) ( caucusing with Democrats ) House of Representatives political groups Republican ( 239 ) Democratic ( 193 ) Vacant ( 3 ) Elections Senate last election November 8 , 2016 House of Representatives last election November 8 , 2016 Meeting place United States Capitol Washington , D.