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All 40 seats in the New Jersey Senate 21 seats needed for a majority | ||||||||||||||||||||||||||||||||||
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 Results by district Democratic hold Democratic gain Republican hold Republican gain | ||||||||||||||||||||||||||||||||||
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| Elections in New Jersey |
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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 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 briefly held 26 seats from January through December 2019 following the party switch of Dawn Addiego bringing Democrats to controlling the highest percentage of seats since 1977. However, a 2019 special election in District 1 reduced Democrats back to 25 seats.
| Contents Summary of results • Incumbents not running By District: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 • 27 • 28 • 29 • 30 • 31 • 32 • 33 • 34 • 35 • 36 • 37 • 38 • 39 • 40 |
Summary of results
| 25 | 15 |
| Democratic | Republican |
| Parties | Seats | Popular vote | ||||||
|---|---|---|---|---|---|---|---|---|
| 2013 | 2017 | +/− | Strength | Vote | % | Change | ||
| Democratic Party | 24 | 25 |  1
|
62.50% | 1,185,420 | 59.5% | +12.1% | |
| Republican Party | 16 | 15 |  1
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37.50% | 802,418 | 40.3% | −11.8% | |
| Green Party | - | - | - | - | 1,306 | 0.1% | - | |
| Libertarian Party | - | - | - | - | 574 | <0.1% | −0.1% | |
| Independent | - | - | - | - | 2,545 | 0.1% | −0.4% | |
| Totals | 40 | 40 | 0 | 100.0% | 1,992,263 | 100.0% | - | |
| Source: Election Statistics – New Jersey Secretary of State (note: does not include blank, write-in and over/under votes) | ||||||||