Mark Proulx
New Hampshire State Representative, District 515 since 2010. Lost re-election in 2026; leaves office in January 2027. Ran in 9 elections between 2010 and 2024, winning 7.
- In office
- 16 yrs
- Since 2010
- Bills became law
- 2
- 7 sponsored, 2025–2026 session
- Votes missed
- 7.9%
- Chamber median 5.8%
- With party
- 79%
- On votes splitting the parties
- Last margin
- −0.5
- Won 2024
- Elections
- 10
- 2010–2026
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 1:52 PM ET
Committees
As of 2026-10.
- Criminal Justice and Public Safety
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where Proulx sits in the New Hampshire House of Representatives
Proulx is closer to the center than 95% of the chamber's Republicans.
Closest: Bill Boyd, Mike Bordes, Karel Crawford
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:56 PM ET
With Proulx’s party
- Votes with the chamber's Republicans79%
- Cosponsorships of the other party's bills41%
Black tick: the average of Republicans in the New Hampshire House of Representatives.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: Proulx’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.
| Date | Bill | Proulx | Rep. majority | Dem. majority | Result |
|---|---|---|---|---|---|
| Aug 19, 2026 | HB 221: enabling electric utilities to own, operate, and offer advanced nuclear resources, and… | No | Yes | No | Failed 152–167 |
| Aug 19, 2026 | HB 1337: repealing the New Hampshire council on autism spectrum disorders. | No | Yes | No | Failed 148–172 |
| Aug 19, 2026 | HB 1442: permitting classification of individuals based on biological sex under certain limited… | No | Yes | No | Passed 165–149 |
| Aug 19, 2026 | HB 1358: establishing a commission to study transitioning all public schools to public charter… | No | Yes | No | Failed 150–166 |
| Aug 19, 2026 | HB 1726: relative to the sale of surplus state-owned land and establishing a commission to study… | No | Yes | No | Failed 101–206 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time Proulx was on a ballot. Filled marks are general elections won; hollow marks are primaries; an orange outline is a loss.
Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Elections
Margin against the seat’s presidential baseline: how the seat voted for president in the same or nearest year.
| Year | Race | Result | Margin | Seat | +/− |
|---|---|---|---|---|---|
| 2026 | New Hampshire House of Representatives: State House District Hillsborough 15 | Lost | — | — | — |
| 2024 | New Hampshire House of Representatives, District 515 | Won | D+0.5 | — | — |
| 2022 | New Hampshire House of Representatives, District 515 | Won | R+0.9 | D+1.2 | +2.1 |
| 2018 | New Hampshire House of Representatives, Hillsborough 44 | Won | R+0.4 | — | — |
| 2016 | New Hampshire House of Representatives, Hillsborough 44 | Won | R+3.6 | — | — |
| 2014 | New Hampshire House of Representatives, Hillsborough 44 | Won | R+1.0 | — | — |
| 2014 | New Hampshire House of Representatives, Hillsborough 44 (primary) | Lost | −50.5 | — | — |
| 2014 | New Hampshire House of Representatives, Hillsborough 44 (primary) | Won | +3.6 | — | — |
| 2012 | New Hampshire House of Representatives, District 515 | Lost | D+4.2 | — | — |
| 2010 | New Hampshire House of Representatives, District 515 | Won | D+1.0 | — | — |
Source: 99chambers results archive; 2026: civicAPI (unofficial)Updated Nov 8, 2026, 7:01 PM ET
Seats Proulx has held
- New Hampshire House of Representatives, District 515 · since 2022
- New Hampshire House of Representatives, District HILLSBOROUGH 44 · since 2014
- New Hampshire House of Representatives, District 515 · since 2010
Source: 99chambers results archive
Who Proulx has run against
- Mark McLean (R) · 2024 election, won
- Andy Martel (R) · 2016 election, won
- Tommy Katsiantonis (D) · 2012 election, lost
- Steve Vaillancourt (R) · 2010 election, won
Source: 99chambers results archive; 2026: civicAPI (unofficial)
How we know Proulx
One person, matched across every source we use.
- Open States ocd-person/b50abef6-0b19-4d5c-97c9-f757f3b571ad
- Wikidata Q123482411
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 1:52 PM ET