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 343 years ago in 1683.
County Snapshot
Middlesex County at a glance
Middlesex County currently has 40 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
40
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
New Jersey counties
21
Open related pagesLargest city
WoodbridgePopulation 99,430
Top linked places
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% |
| Latitude & Longitude | 40.4400,-74.4089 |
| Named for | Middlesex |
| Capital | New Brunswick |
| Establishment | March 07, 1683 |
| Time Zone | Eastern Time Zone |
| Local time | 02:51:42 (15th April 2026) |
| Density | 985 Pop. per km² as of 2020 |
| Population growth | 1.57% (2010-2020) |
| Weather | 64℉ Slight Chance Showers And Thunderstorms then Partly Cloudy 7-days weather |
Geography
Middlesex County is located at 40°26'24"N 74°24'32"W (40.4400400, -74.4088900).
Middlesex County map
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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 |
Weather
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 64. Southwest wind 5 to 10 mph. Chance of precipitation...
7-Day Forecast- 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 |
People born in Middlesex County (4)
People born in Middlesex County, including basketball player Andrew Bynum, politician James F. Randolph, politician Simon B. Conover, .
More notable people
- Edward Mundy (American judge) he was born in 14/04/1794
Other places with the same name (3)
- Middlesex County, Massachusetts county in Massachusetts, United States with a population of 1,609,379 people.
- Middlesex County, Connecticut county in Connecticut, United States with a population of 161,657 people.
- Middlesex County, Virginia county in Virginia, United States with a population of 10,569 people.
New Jersey Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Somerset | 965,424 | This large community in Somerset County, New Jersey, is situated at an elevation of 92 feet. |
| 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 |