The 2017 New Jersey State Senate elections were held on November 7, 2017, to elect senators for all 40 legislative districts across New Jersey. These elections coincided with the election of Governor Phil Murphy. The winners of this election would serve in the 218th New Jersey Legislature, with seats apportioned based on the 2010 United States census. The Democratic Party grew its majority in the Senate, with incumbent Senate President Steve Sweeney re-elected to the top leadership post. Republican Thomas Kean, Jr. continued to lead his party as minority leader. This was the first state Senate election cycle in 10 years where any party flipped a Senate seat.
Democrats flipped the 7th and 11th districts, while Republicans flipped the 2nd. Democrats briefly held 26 seats from January through December 2019 following the party switch of Dawn Addiego, resulting in the Democrats controlling the highest percentage of seats since 1977. However, a 2019 special election in District 1 reduced the Democrats back to 25 seats.
!style="background-color:#E9E9E9" align=center rowspan= 2 colspan=2| Parties !style="background-color:#E9E9E9" align=center colspan=4| Seats !style="background-color:#E9E9E9" align=center colspan=3| Popular vote |- bgcolor=#E9E9E9 | align="center" | 2013 | align="center" |2017 | align="center" |+/â | align="center" |Strength | align="center" |Vote | align="center" |% | align="center" |Change |- | style="background-color:;" | | align="left" | Democratic Party | align="right" | 24 | align="right" | 25 | align="right" | 1 | align="right" | 62.50% | align="right" | 1,185,420 | align="right" | 59.5% | align="right" | +12.1% |- | style="background-color:;" | | align="left" | Republican Party | align="right" | 16 | align="right" | 15 | align="right" | 1 | align="right" | 37.50% | align="right" | 802,418 | align="right" | 40.3% | align="right" | âÂÂ11.8% |- | style="background-color:;" | | align="left" | Green Party | align="right" | -
| align="right" | - | align="right" | - | align="right" | - | align="right" | 1,306 | align="right" | 0.1% | align="right" | - |- | style="background-color:;" | | align="left" | Libertarian Party | align="right" | - | align="right" | - | align="right" | - | align="right" | - | align="right" | 574 | align="right" | <0.1% | align="right" | âÂÂ0.1% |- | style="background-color:;" | | align="left" | Independent | align="right" | - | align="right" | - | align="right" | - | align="right" | - | align="right" | 2,545 | align="right" | 0.1% | align="right" | âÂÂ0.4% |- bgcolor=CCCCCC | align="center" colspan="2" | Totals | align="center" | 40 | align="center" | 40 | align="center" | 0 | align="center" | 100.0% | align="center" | 1,992,263 | align="center" | 100.0% | align="center" | - |- bgcolor=E9E9E9 | align="left" colspan=9|Source: http://njelections.org/2017-results/2017-official-general-election-results-state-senate.pdf Election Statistics â New Jersey Secretary of State (note: does not include blank, write-in and over/under votes) |-
In addition, four members who were elected in the prior election in 2013 had since left office: Donald Norcross (D-5th, resigned), Peter J. Barnes III (D-18th, resigned), Kevin J. O'Toole (R-40th, resigned), and Jim Whelan (D-2nd, died in office).
Seats where the margin of victory was under 10%:
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Incumbent Democratic senator Jim Whelan declined to seek a fourth term, announcing his retirement on January 4, 2017. Whelan died in office on August 22.
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Following the death of Whelan on August 22, 2017, Bell was unanimously selected to fill the remainder of his term by local Democratic committee members on September 5, and was sworn in on October 5.
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Pascetta was not on the official list of candidates for the general election.
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Citing health concerns, incumbent Republican senator Diane Allen declined to run for a seventh term, announcing her retirement on January 31, 2017.
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On June 13, Governor Chris Christie nominated Prisco to a worker's compensation judgeship, whom consequently would later drop out. Local Republican committee members selected Delanco Mayor John Browne as a replacement candidate on September 6.
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Incumbent Republican senator Joe Kyrillos announced that he would not run for a ninth term on October 25, 2016.
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Csizmar was replaced on the ballot for the general election by Lewis Glogower, who was previously one of the nominees for the Assembly seat.
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Following the primary, Rittenhouse dropped out of the race on September 14.
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Incumbent Democratic senator Raymond Lesniak declined to run for re-election and instead ran for governor.
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No Republicans filed.
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Incumbent Republican senator Kevin J. O'Toole announced on January 15, 2016, that he would not run for re-election. On March 13, 2017, he was confirmed by the state senate to the board of commissioners of The Port Authority of New York and New Jersey. O'Toole, however, did not immediately resign to accept the position, staying for the time being in his Senate seat to "tie up loose ends." He officially resigned his seat on July 1.
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Following O'Toole's resignation, Corrado was selected without opposition by local Republican committee members to serve the remainder of his term on July 26, and was sworn in on October 5.
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