| Election Name: | 2017 Westchester County Board of Legislators election |
| Country: | Westchester County |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2015 Westchester County Board of Legislators elections |
| Previous Year: | 2015 |
| Next Election: | 2019 Westchester County Board of Legislators elections |
| Next Year: | 2019 |
| Seats For Election: | All 17 seats on the Westchester County Board of Legislators |
| Election Date: | November 7, 2017 |
| Party1: | Democratic Party (United States) |
| Last Election1: | 9 |
| Seats1: | 12 |
| Seat Change1: | 3 |
| Popular Vote1: | 123,701 |
| Percentage1: | 65.39% |
| Swing1: | 6.71% |
| Party2: | Republican Party (United States) |
| Last Election2: | 7 |
| Seats2: | 4 |
| Seat Change2: | 3 |
| Popular Vote2: | 55,310 |
| Percentage2: | 29.24% |
| Swing2: | 6.81% |
| Party3: | Conservative Party of New York State |
| Last Election3: | 1 |
| Seats3: | 1 |
| Popular Vote3: | 8,117 |
| Percentage3: | 4.29% |
| Swing3: | 0.11% |
The 2017 Westchester County Board of Legislators elections were held on 7 November 2017 in conjunction with the 2017 Westchester County Executive election. The elections resulted in major gains for the Democratic Party[1] with the party flipping three previously Republican seats and control of the County Legislature from a Republican led Coalition. Benjamin Boykin became chair of the board and Catherine Parker Majority leader. Lohud attributed the major Democratic gains in heavily Democratic Westchester County as a reaction to the election of Donald Trump at the 2016 United States presidential election. The Democratic vote increased 6.71% as compared with the 2015 board of legislator elections. Democrats gained one seat they had previously left uncontested, the Peekskill based District 1 in addition to winning Districts 2 and 10 with their vote share increasing 8.13% and 5.48% respectively.
Members of the Board of Legislators are elected every two years during the off-year elections. Elections are conducted using first-past-the-post in 17 single member districts. Like all partisan elections in New York, fusion tickets are used.
| 2017 Westchester County Board of Legislators Election Results[2] | ||||||||
|---|---|---|---|---|---|---|---|---|
| Party | Candidates | Votes | % | % +/– | Seats | Seats +/– | ||
| Democratic | 16 | 123,701 | 65.39% | 6.71% | 12 | 3 | ||
| Republican | 9 | 55,310 | 29.24% | 6.81% | 4 | 3 | ||
| Conservative | 1 | 8,117 | 4.29% | 0.11% | 1 | |||
| Independence | 1 | 1,017 | 0.54% | New | 0 | New | ||
| Working Families | 1 | 650 | 0.34% | New | 0 | New | ||
| Write-in | N/A | 380 | 0.20% | 0.17% | 0 | 0 | ||
| Valid votes | 28 | 189,175 | 84.12% | 4.92% | 17 | |||
| Blank votes | – | 35,724 | 15.88% | 4.92% | – | – | ||
| Registered voters/Turnout | – | 598,126[3] | 37.6% | 14.4%[4] | – | – | ||
| Source: Westchester County Board of Elections results | ||||||||
BOLD represents a flip and ITALICS represent a new legislator of the same party.
| District | Incumbent | Party | +/- D% | Elected Legislator | Party< | --Bolding and Italicizing is deliberate. Bold represents a flip and italics represent a new Legislator of the same party.--> | ||
|---|---|---|---|---|---|---|---|---|
| 1 | John G. Testa | Rep | +43.86% | John G. Testa | Rep | |||
| 2 | Francis T. Corcoran | Rep | +8.13% | Kitley Covill | Dem | |||
| 3 | Margareta A. Cunzio | Con | +0.88% | Margareta A. Cunzio | Con | |||
| 4 | Michael B. Kaplowitz | Dem | –0.01% | Michael B. Kaplowitz | Dem | |||
| 5 | Benjamin Boykin II | Dem | +0.45% | Benjamin Boykin II | Dem | |||
| 6 | David B. Gelfarb | Rep | +53.03% | Nancy E. Barr | Dem | |||
| 7 | Catherine F. Parker | Dem | +7.04% | Catherine F. Parker | Dem | |||
| 8 | Alfreda A. Williams | Dem | +0.27% | Alfreda A. Williams | Dem | |||
| 9 | Catherine A. Borgia | Dem | –1.72% | Catherine A. Borgia | Dem | |||
| 10 | Sheila M. Marcotte | Rep | +5.48% | Damon R. Mather | Dem | |||
| 11 | James Maisano | Rep | N/A | James Maisano | Rep | |||
| 12 | MaryJane C. Shimsky | Dem | +0.06% | MaryJane C. Shimsky | Dem | |||
| 13 | Lyndon D. Williams | Dem | +0.09% | Lyndon D. Williams | Dem | |||
| 14 | Bernice Spreckman | Rep | –0.32% | David J. Tubiolo | Rep | |||
| 15 | Gordon A. Burrows | Rep | +6.58% | Gordon A. Burrows | Rep | |||
| 16 | Ken Jenkins | Dem | –15.34% | Christopher A. Johnson | Dem | |||
| 17 | Jose I. Alvadrado | Dem | +5.19% | Jose I. Alvadrado | Dem | |||
Districts where the margin of victory was under 10%: