New Jersey State Senate seat · lines in effect since 2023
New Jersey Legislative District 10
A district of about 231,000 people, 42% of adults with a bachelor's degree. It votes R+26.7 relative to the nation for president.
2023 election
Nov 7, 2023- Jim Holzapfel (R) · won66.6%
- Jeff J. Horn (D)33.4%
Source: New Jersey Division of ElectionsUpdated Sep 30, 2026, 1:01 PM ET
Where it sits among all 40 seats
Every New Jersey State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every election for this seat
17 races since 1971; the seat changed party 3 times. District numbers are redrawn after each census: each group is one set of lines.
| Year | Winner | Runner-up | Won by |
|---|---|---|---|
| Lines first used in 2023 | |||
| 2023 | Jim Holzapfel (R) | Jeff J. Horn (D) | 33.1 |
| Lines first used in 2012 | |||
| 2021 | Jim Holzapfel (R) | Emma Mammano (D) | 38.0 |
| 2017 | Jim Holzapfel (R) | Emma Mammano (D) | 25.1 |
| 2013 | Jim Holzapfel (R) | John Bendel (D) | 39.4 |
| Lines first used in 2002 | |||
| 2011 | Jim Holzapfel (R) | Charles P. Tivenan (D) | 28.1 |
| 2007 | Andrew R. Ciesla (R) | Britta Forsberg Wenzel (D) | 30.2 |
| 2003 | Andrew R. Ciesla (R) | James M. Blaney (D) | 30.2 |
| Lines first used in 1992 | |||
| 2001 | Andrew R. Ciesla (R) | Timothy E. Ryan (D) | 13.6 |
| 1997 | Andrew R. Ciesla (R) | Judtih G. Leone (D) | 25.2 |
| 1993 | Andrew R. Ciesla (R) | Anthony Carracino (D) | 25.8 |
| Lines first used in 1982 | |||
| 1991 | Andrew R. Ciesla (R)Flip | John Paul Doyle (D) | 23.2 |
| 1987 | John F. Russo (D) | Tom Blomquist (R) | 16.7 |
| 1983 | John F. Russo (D) | Bob Fall (R) | 26.7 |
| Lines first used in 1972 | |||
| 1981 | John F. Russo (D)Flip | Hazel Gluck (R) | 17.3 |
| 1977 | Brian T. Kennedy (R)Flip | Herbert J. Buehler (D) | 9.5 |
| 1973 | Herbert J. Buehler (D) | Richard R. Stout (R) | 10.2 |
| Lines first used in 1962 | |||
| 1971 | Joseph J. Maraziti (R) | Peter W. Thomas (R) | 2.7 |
Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Districts that overlap District 10
The state's districts in other chambers that share residents with this one, and the share of District 10's area in each.
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2024 | |
|---|---|
| President | R+27.8 |
| U.S. Senate | R+22.7 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 8, 2026, 7:01 PM ET
Who lives here, compared
Grey bars show the spread of all 40 seats. Small marks are other seats in New Jersey. The black marker is District 10.
Lower than 59% of seats.
Higher than 92% of seats.
Lower than 77% of seats.
Lower than 74% of seats.
Lower than 90% of seats.
Denser than 51% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 1243% college gradsR+23.2Not up in 2026District 30
43% college gradsR+44.4Not up in 2026District 24
45% college gradsR+18.6Not up in 2026District 13
53% college gradsR+13.5Not up in 2026
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET