How many U.S. Senate seats changed party in 2018?

6 seats changed party in the 2018 Senate elections: Arizona (Republican to Democrat), Florida (Democrat to Republican), Indiana (Democrat to Republican), Missouri (Democrat to Republican), Nevada (Republican to Democrat), North Dakota (Democrat to Republican).

Which new senators were elected in 2018?

8 new senators won seats in 2018: Kyrsten Sinema (Democrat-AZ), Rick Scott (Republican-FL), Mike Braun (Republican-IN), Josh Hawley (Republican-MO), Jacky Rosen (Democrat-NV), Kevin Cramer (Republican-ND), Marsha Blackburn (Republican-TN), Mitt Romney (Republican-UT).

2018 U.S. Senate Elections: Results

35 Senate seats were decided on Tuesday, November 6, 2018: the 33 Class I seats and 2 special elections. 27 incumbents kept their seats, 8 new senators were elected, and 6 seats changed party.

All cycles 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 2022 2024 2026 2028 2030

Seats on the ballot

33 Class I + 2 special

Held going in

24 Democrat · 9 Republican · 2 Independent

New senators

27 incumbents re-elected

Seats that changed party

AZ, FL, IN, MO, NV, ND

Special Elections

Minnesota (Class II seat): Tina Smith (Democrat) was appointed on January 3, 2018 and held the seat going into the special election on November 6, 2018. Won it outright, serving the remainder of the term through January 3, 2021.
Mississippi (Class II seat): Cindy Hyde-Smith (Republican) was appointed on April 9, 2018 and held the seat going into the special election on November 6, 2018. Won it outright, serving the remainder of the term through January 3, 2021.

Every Seat on the 2018 Ballot

Incumbent is whoever held the seat on election day; the result is who was sworn in for it afterwards.

State ▲	Incumbent ↕	Party ↕	Seat ↕	Since ↕	Age on Election Day ↕	Result ↕
Arizona	Jeff Flake Since 2013	Republican	Class I	2013		Kyrsten Sinema (Democrat) Party change
California	Dianne Feinstein Since 1992	Democrat	Class I	1992		Re-elected
Connecticut	Chris Murphy Since 2013 · age 45	Democrat	Class I	2013	45	Re-elected
Delaware	Tom Carper Since 2001 · age 71	Democrat	Class I	2001	71	Re-elected
Florida	Bill Nelson Since 2001	Democrat	Class I	2001		Rick Scott (Republican) Party change
Hawaii	Mazie Hirono Since 2013 · age 71	Democrat	Class I	2013	71	Re-elected
Indiana	Joe Donnelly Since 2013	Democrat	Class I	2013		Mike Braun (Republican) Party change
Maine	Angus King Since 2013 · age 74	Independent	Class I	2013	74	Re-elected
Maryland	Benjamin Cardin Since 2007	Democrat	Class I	2007		Re-elected
Massachusetts	Elizabeth Warren Since 2013 · age 69	Democrat	Class I	2013	69	Re-elected
Michigan	Debbie Stabenow Since 2001	Democrat	Class I	2001		Re-elected
Minnesota	Amy Klobuchar Since 2007 · age 58	Democrat	Class I	2007	58	Re-elected
Minnesota	Tina Smith Since 2018 · age 60	Democrat	Class II Special Appointed	2018	60	Held seat
Mississippi	Roger Wicker Since 2007 · age 67	Republican	Class I	2007	67	Re-elected
Mississippi	Cindy Hyde-Smith Since 2018 · age 59	Republican	Class II Special Appointed	2018	59	Held seat
Missouri	Claire McCaskill Since 2007	Democrat	Class I	2007		Josh Hawley (Republican) Party change
Montana	Jon Tester Since 2007 · age 62	Democrat	Class I	2007	62	Re-elected
Nebraska	Deb Fischer Since 2013 · age 67	Republican	Class I	2013	67	Re-elected
Nevada	Dean Heller Since 2011	Republican	Class I	2011		Jacky Rosen (Democrat) Party change
New Jersey	Robert Menendez Since 2006	Democrat	Class I	2006		Re-elected
New Mexico	Martin Heinrich Since 2013 · age 47	Democrat	Class I	2013	47	Re-elected
New York	Kirsten Gillibrand Since 2009 · age 51	Democrat	Class I	2009	51	Re-elected
North Dakota	Heidi Heitkamp Since 2013	Democrat	Class I	2013		Kevin Cramer (Republican) Party change
Ohio	Sherrod Brown Since 2007 · age 65	Democrat	Class I	2007	65	Re-elected
Pennsylvania	Bob Casey Since 2007 · age 58	Democrat	Class I	2007	58	Re-elected
Rhode Island	Sheldon Whitehouse Since 2007 · age 63	Democrat	Class I	2007	63	Re-elected
Tennessee	Bob Corker Since 2007	Republican	Class I	2007		Marsha Blackburn (Republican)
Texas	Ted Cruz Since 2013 · age 47	Republican	Class I	2013	47	Re-elected
Utah	Orrin Hatch Since 1977	Republican	Class I	1977		Mitt Romney (Republican)
Vermont	Bernie Sanders Since 2007 · age 77	Independent	Class I	2007	77	Re-elected
Virginia	Tim Kaine Since 2013 · age 60	Democrat	Class I	2013	60	Re-elected
Washington	Maria Cantwell Since 2001 · age 60	Democrat	Class I	2001	60	Re-elected
West Virginia	Joe Manchin, III Since 2010	Democrat	Class I	2010		Re-elected
Wisconsin	Tammy Baldwin Since 2013 · age 56	Democrat	Class I	2013	56	Re-elected
Wyoming	John Barrasso Since 2007 · age 66	Republican	Class I	2007	66	Re-elected

New Senators Elected in 2018

Kyrsten Sinema

Democrat · Arizona

Succeeded Jeff Flake (Republican)

Rick Scott

Republican · Florida

Succeeded Bill Nelson (Democrat)

Mike Braun

Republican · Indiana

Succeeded Joe Donnelly (Democrat)

Josh Hawley

Republican · Missouri

Succeeded Claire McCaskill (Democrat)

Jacky Rosen

Democrat · Nevada

Succeeded Dean Heller (Republican)

Kevin Cramer

Republican · North Dakota

Succeeded Heidi Heitkamp (Democrat)

Marsha Blackburn

Republican · Tennessee

Succeeded Bob Corker

Mitt Romney

Republican · Utah

Succeeded Orrin Hatch

About this page

Seats, incumbents and results are derived from the Senate's service records (via the congress-legislators dataset): the seats on a year's ballot are the class whose terms end the following January, plus any seat held by appointment pending a special election, and a result is recorded when the winner is sworn in. Incumbent status and candidates for the next election come from FEC candidate filings; a seat is listed as open when the FEC tags its candidates as running for a seat with no incumbent. Election day is the Tuesday after the first Monday in November. See every cycle since 1990, the seniority list and the voting analysis.