Middlesex County, New Jersey

Middlesex County: County in New Jersey, United States

About

Middlesex County is a county located in the U.S. state of New Jersey. As of the 2010 census, the population was 809,858 and a population density of 970 people per km². After 10 years in 2020 county had an estimated population of 822,736 inhabitants. Its county seat is New Brunswick. The county was created 341 years ago in 1683.

Middlesex County locator map
Location of Middlesex County on New Jersey map.

Quick Facts about Middlesex County

Population : 822,736 (2020)
Country : United States of America
State : New Jersey (United States)
Different from : Middlesex County, Middlesex County, Middlesex County
Twitter username : middlesexcntynj
Area : 835 km2
Water as percent of area : 4.31%
Land as percent of area : 95.69%
Named for : Middlesex
Capital : New Brunswick
Establishment : March 03, 1683
Time Zone : Eastern Time Zone
Local time : 03:32:47 (22nd February 2025)
Density : 985 Pop. per km² as of 2020
Population growth : 1.57% (2010-2020)
Bishop House New Brunswick NJ - campus gate image
Bishop House New Brunswick NJ - campus gate
Bishop House New Brunswick NJ - campus gate image
Bishop House New Brunswick NJ - campus gate image

Geography

Middlesex County is located at 40°26'24"N 74°24'32"W (40.4400400, -74.4088900).

Middlesex County map

Click "full screen" full screen map icon to open full mode. View satellite images

The largest city of Middlesex County is New Brunswick with a population of 56,182. Other cities include, Perth Amboy population 51,309, Sayreville population 43,855, Sayreville Junction population 42,890 and South Plainfield population 23,965. See all Middlesex County cities & populated places.

Middlesex County Populated Places (more)

Cities, towns, neighborhoods & other populated places in Middlesex County.

City Name Population Title
Woodbridge 99,430 Census-designated place in New Jersey, United States
Edison 98,721 Township in Middlesex County, New Jersey, United States
Menlo Park 97,687 Township in Middlesex County, New Jersey, United States
Old Bridge 65,414 Census-designated place in Old Bridge Township, Middlesex County, New Jersey
Piscataway 57,164 Township in New Jersey, United States
New Brunswick 56,182 The most populous city in Middlesex County, New Jersey.
Perth Amboy 51,309 The most populous city in Middlesex County, New Jersey.
East Brunswick 48,309 Township in Middlesex County, New Jersey
Sayreville 43,855 A borough in Middlesex County, New Jersey.
Sayreville Junction 42,890 A census-designated place in Middlesex County, New Jersey.
South Plainfield 23,965 Borough in Middlesex County, New Jersey
Carteret 23,383 Borough in Middlesex County, New Jersey, United States
South Old Bridge 23,233 City in Middlesex County, New Jersey, United States of America
Plainsboro 22,709 Township in Middlesex County, New Jersey
Morristown 19,229 Town in Morris County, New Jersey, USA
Iselin 18,695 Unincorporated community in New Jersey, United States

Middlesex County has 1 neighbours.

  • New Brunswick

Demographics

The population of Middlesex County increased by 1.57% in 10 years.

Year Population % Change Method
2010 809,858 - census
2011 815,198 0.66% estimation process
2012 819,344 0.51% estimation process
2013 821,743 0.29% estimation process
2014 824,160 0.29% estimation process
2015 825,546 0.17% estimation process
2016 825,457 -0.01% estimation process
2017 827,363 0.23% estimation process
2018 826,172 -0.14% estimation process
2019 825,062 -0.13% estimation process
2020 822,736 -0.28% estimation process
Map of countries with a smaller population than Middlesex County

Comitatul Middlesex, Comte de Middlesex, Comté de Middlesex, Condado de Middlesex, Condado han Middlesex, Contea di Middlesex, Hrabstwo Middlesex, Middlesex, Middlesex Kun, Middlesex Kūn, Middlesex konderria, Middlesex megye, Middlseks, Midlseks, Midulseks, Okrug Midlseks, Quan Middlesex, Quận Middlesex, mi de sa ke si jun, midalaseksa ka'unti, midorusekkusu jun, shhrstan mydlsks nywjrsy, Мидлсекс, Мидълсекс, Міддлсекс, Округ Мидлсекс, Միդլսեքս շրջան, شهرستان میدلسکس، نیوجرسی, مقاطعة ميدلسكس, مڈلسکس کاؤنٹی، نیو جرسی, مڈلسیکس کاؤنٹی، نیو جرسی, মিডলসেক্স কাউন্টি, ミドルセックス郡, 密德薩克斯郡

People born in Middlesex County (4)

People born in Middlesex County, including basketball player Andrew Bynum, politician James F. Randolph, politician Simon B. Conover, .

List

Other places with the same name (4)

New Jersey Other Counties (more counties)

County Name Population Title
Somerset 965,424 Community in Franklin Township, New Jersey
Bergen County 930,394 County in New Jersey, United States
Essex County 800,501 County in New York, United States
Hudson County 671,666 County in New Jersey, United States
Monmouth County 618,381 County in New Jersey, United States
Ocean County 614,237 County in New Jersey, United States
Union County 555,394 County in Oregon, United States
Camden County 506,809 County in Missouri, United States
Passaic County 500,382 County in New Jersey, United States
Morris County 491,087 County in New Jersey, United States
Burlington County 446,596 County in New Jersey, United States
Mercer County 367,239 County in West Virginia, United States
Somerset County 329,331 County in Maine, United States
Gloucester County 293,245 County in New Jersey, United States
Newark 282,520 The most populous city in New Jersey and the center of the Newark metropolitan area.
Atlantic County 262,945 County in New Jersey, United States