New Jersey State Senate District 23

State Legislative District Profile (Upper Chamber)

Overview

District ID
nj-sd-023
State
New Jersey
Chamber
Upper chamber (state senate)
District Code
023
Land Area
565.8 sq mi
Water Area
9.96 sq mi

Boundary

Boundary of New Jersey State Senate District 23

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Warren County316.72 sq mi56.0%88.8%
Hunterdon County182.69 sq mi32.3%42.7%
Somerset County66.36 sq mi11.7%22.0%

Showing all 3 counties

Places

PlaceOverlapShare of district landShare of place land
Martinsville CDP12.15 sq mi2.1%100.0%
Bridgewater Center CDP5.83 sq mi1.0%100.0%
Bedminster CDP4.65 sq mi0.8%100.0%
Green Knoll CDP4.64 sq mi0.8%100.0%
Bradley Gardens CDP4.49 sq mi0.8%100.0%
Lamington CDP4.33 sq mi0.8%100.0%
Finderne CDP4.09 sq mi0.7%100.0%
Hackettstown town3.61 sq mi0.6%100.0%
Phillipsburg town3.19 sq mi0.6%100.0%
Beattystown CDP3.03 sq mi0.5%100.0%
Brass Castle CDP2.94 sq mi0.5%100.0%
Manville borough2.36 sq mi0.4%100.0%
Somerville borough2.34 sq mi0.4%100.0%
Marksboro CDP2.15 sq mi0.4%100.0%
Finesville CDP2.12 sq mi0.4%100.0%
Raritan borough1.99 sq mi0.4%100.0%
Washington borough1.97 sq mi0.3%100.0%
Oldwick CDP1.80 sq mi0.3%100.0%
Alpha borough1.68 sq mi0.3%100.0%
Bound Brook borough1.66 sq mi0.3%100.0%
Glen Gardner borough1.55 sq mi0.3%100.0%
Hampton borough1.51 sq mi0.3%100.0%
Hainesburg CDP1.50 sq mi0.3%100.0%
Belvidere town1.45 sq mi0.3%100.0%
Silver Lake CDP1.26 sq mi0.2%100.0%

Showing top 25 of 57 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
NJ District 7210,76888.6%27.2%98.8%
NJ District 1227,15011.4%3.5%1.2%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
186,457
Active Voters
171,497 (92.0%)

Party Registration

PartyVotersShare
Democratic53,85928.9%
Republican69,66237.4%
Unaffiliated60,52332.5%
Other parties2,4131.3%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–2026101,690 (54.5%)17,221 (9.2%)21,764 (11.7%)
2023–2024131,422 (70.5%)12,342 (6.6%)17,911 (9.6%)
2021–202299,150 (53.2%)11,873 (6.4%)22,851 (12.3%)
2019–2020131,470 (70.5%)21,625 (11.6%)25,003 (13.4%)
2017–201892,854 (49.8%)11,793 (6.3%)14,901 (8.0%)
2015–2016100,436 (53.9%)14,422 (7.7%)20,443 (11.0%)
2013–201461,879 (33.2%)6,026 (3.2%)12,471 (6.7%)
2011–201281,115 (43.5%)3,031 (1.6%)9,692 (5.2%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 01/02/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
240,856 (± 385)
Median Age
43.0
Median Household Income
$112,625 (± $3,140)
High School Graduate or Higher (age 25+)
94.2%
Bachelor's Degree or Higher (age 25+)
44.6%

Population by Age

GroupPeopleShare
Under 1847,75519.8%
18 to 64147,91661.4%
65 and over45,18518.8%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)37,80715.7%
White, not Hispanic161,17866.9%
Black, not Hispanic11,6694.8%
Asian, not Hispanic19,8948.3%
American Indian / Alaska Native, not Hispanic1050.0%
Native Hawaiian / Pacific Islander, not Hispanic940.0%
Some other race, not Hispanic1,2870.5%
Two or more races, not Hispanic8,8223.7%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
224,864
Citizen Voting Age Population (CVAP)
178,478

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic195,08486.8%
Hispanic29,77913.2%
White162,44272.2%
Black11,8005.2%
Asian15,0786.7%
American Indian / Alaska Native1170.1%
Native Hawaiian / Pacific Islander1060.0%
Two or More Races4510.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic158,78089.0%
Hispanic19,69411.0%
White135,55375.9%
Black9,9585.6%
Asian12,3016.9%
American Indian / Alaska Native5130.3%
Native Hawaiian / Pacific Islander940.1%
Two or More Races4130.2%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).