John DiMaio
New Jersey State Assemblymember, District 23 since 2009. Next on the ballot in 2027.
- In office
- 17 yrs
- Since 2009
- Bills became law
- 5
- 147 sponsored, 2025–2026 session
- Votes missed
- 5.4%
- Chamber median 4.1%
- With party
- 92%
- On votes splitting the parties
- Last margin
- +1.0
- Won 2025
- Next election
- 2027
- Nov 2, 2027
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET
Committees
As of 2026-10.
- Legislative Services Commission
- State House Commission
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
Introduced Jun 2026
Introduced May 2026
Introduced May 2026
Introduced May 2026
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where DiMaio sits in the New Jersey General Assembly
DiMaio is closer to the center than 39% of the chamber's Republicans.
Closest: Paul Kanitra, Gerry Scharfenberger,
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:57 PM ET
With DiMaio’s party
- Votes with the chamber's Republicans92%
- Cosponsorships of the other party's bills33%
Black tick: the average of Republicans in the New Jersey General Assembly.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: DiMaio’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.
| Date | Bill | DiMaio | Rep. majority | Dem. majority | Result |
|---|---|---|---|---|---|
| Dec 22, 2025 | A 2090: Requires solid waste management district to develop strategy to reduce food waste;… | No | No | Yes | Passed 54–19 |
| Dec 22, 2025 | A 1657: Permits certain mental health professionals working in school districts to refer or help… | Yes | No | Yes | Passed 58–12 |
| Dec 22, 2025 | A 3016: Allows follow-up communication by operators of mental health and suicide crisis resources… | No | No | Yes | Passed 60–14 |
| Jun 30, 2025 | A 5804: Modifies payer of additional fees and taxes imposed on certain real property transfers;… | No | No | Yes | Passed 41–37 |
| Jun 30, 2025 | A 3361: Establishes limit on rent increase for certain dwelling sites for modular or… | No | No | Yes | Passed 56–23 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time DiMaio 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 |
|---|---|---|---|
| 2025 | New Jersey General Assembly, District 23 | Won | R+1.0 |
| 2023 | New Jersey General Assembly, District 23 | Won | R+0.7 |
| 2021 | New Jersey General Assembly, District 23 | Won | R+0.8 |
| 2019 | New Jersey General Assembly, District 23 | Won | R+0.1 |
| 2017 | New Jersey General Assembly, District 23 | Won | R+1.4 |
| 2015 | New Jersey General Assembly, District 23 | Won | R+1.1 |
| 2013 | New Jersey General Assembly, District 23 | Won | D+0.1 |
| 2011 | New Jersey General Assembly, District 23 | Won | R+0.3 |
| 2009 | New Jersey General Assembly, District 23 | Won | R+0.8 |
Source: 99chambers results archive
Seats DiMaio has held
- New Jersey General Assembly, District 23 · since 2009
Source: 99chambers results archive
Who DiMaio has run against
- Erik Peterson (R) · 2025 general, won
- Erik Peterson (R) · 2023 general, won
- Erik Peterson (R) · 2021 general, won
- Erik Peterson (R) · 2019 general, won
- Erik Peterson (R) · 2017 general, won
- Erik Peterson (R) · 2015 general, won
Source: 99chambers results archive
How we know DiMaio
One person, matched across every source we use.
- Open States ocd-person/dce6ec3a-7d62-4b33-8693-259364c85285
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET