Middlesex County, Connecticut

Middlesex County: County in Connecticut, United States

About

Middlesex County is a county located in the U.S. state of Connecticut. As of the 2010 census, the population was 165,676 and a population density of 146 people per km². After 10 years in 2020 county had an estimated population of 161,657 inhabitants. Its county seat is Middletown. The county was created 239 years ago in 1784.

Middlesex County is located in central Connecticut along the state's southern coastline. It spans about 400 square miles and includes suburban towns as well as rural areas.

As of the 2020 census, the population of Middlesex County was around 160,000 people. The county seat and most populous city is Middletown.

Middlesex County was founded in 1785 and named for Middlesex, England. It is bisected by the Connecticut River.

Key Facts and History

  • Native American tribes like the Wongunk and Mattabesec originally inhabited the area. Europeans arrived in the 1600s.
  • Early colonists established shipping and shipbuilding industries, using the Connecticut River. Granite quarrying also thrived.
  • Middletown grew as a busy port and industrial center. Manufacturing was a major employer for centuries.
  • Wesleyan University opened in Middletown in 1831 and remains a prestigious liberal arts college.
  • Tourism later became popular as a resort area with beaches along the shoreline.

Major Industries and Attractions Today

  • While manufacturing has declined, aerospace and other high-tech industries now employ many residents.
  • The Connecticut River, Long Island Sound beaches, and forests provide recreation. Popular activities include boating, fishing, and hiking.
  • There are several yacht clubs and marinas, as well as golf courses and country clubs.
  • Historic attractions include Essex Steam Train and Riverboat rides, plus museums and colonial villages.

Transportation and Cities

  • Major highways are Interstates 95 and 91, and Routes 9 and 17.
  • The Shore Line East railroad connects Middletown and other towns to New Haven and New London.
  • Besides Middletown, other population centers include Clinton, Old Saybrook, and Haddam.
Middlesex County locator map
Location of Middlesex County on Connecticut map.

Quick Facts about Middlesex County

Population : 161,657 (2020)
Country : United States of America
State : Connecticut (United States)
Different from : Middlesex County, Middlesex County, Middlesex County
Area : 1137 km2
Water as percent of area : 15.9%
Land as percent of area : 84.1%
Named for : Middlesex
Capital : Middletown
Establishment : January 01, 1785
Time Zone : America/New_York
Local time : 15:47:22 (2nd March 2024)
Density : 142 Pop. per km² as of 2020
Population growth : -2.49% (2010-2020)
Middletown  CT - Raymond E Baldwin Courthouse 01 image
Middletown CT - Raymond E Baldwin Courthouse 01
Middletown  CT - Raymond E Baldwin Courthouse 01 image

Geography

Middlesex County is located at 41°26'7"N 72°31'23"W (41.4353800, -72.5231200). It has 4 neighbors: Hartford County, New Haven County, New London County and Suffolk County.

Middlesex County map

The largest city of Middlesex County is Middletown with a population of 46,013. Other cities include, East Haddam population 8,956, Haddam population 8,150, Killingworth population 6,340 and Saybrook Manor population 1,052. 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
Middletown 46,013 A city in Middlesex County, Connecticut.
Cromwell 13,772 Town in Connecticut, United States
Clinton 12,881 Town located on Long Island Sound in Middlesex County, Connecticut, United States
East Hampton 12,747 Town in Middlesex County, Connecticut, United States
Old Saybrook 9,983 Town in Middlesex County, Connecticut, USA
Portland 9,213 Town in Connecticut, United States
East Haddam 8,956 City in Middlesex County, Connecticut, United States of America
Haddam 8,150 Human settlement in Middlesex County, Connecticut, United States of America
Durham 7,137 Town in Connecticut, United States
Westbrook 6,842 Town in Connecticut, United States
Essex 6,634 Town in Middlesex County, Connecticut, United States
Killingworth 6,340 Human settlement in Middlesex County, Connecticut, United States of America
Deep River 4,419 Town in Middlesex County, Connecticut, United States
Middlefield 4,350 Town in Connecticut, USA
Chester 4,175 Town in Middlesex County, Connecticut, United States
Lake Pocotopaug 3,436 Census designated place

Middlesex County has 4 neighbours.

Demographics

According to census records, the population of Middlesex County decreased by 2.49% in 10 years.

Year Population % Change Method
2010 165,676 - census
2011 166,174 0.3% estimation process
2012 165,634 -0.33% estimation process
2013 165,329 -0.18% estimation process
2014 164,786 -0.33% estimation process
2015 163,724 -0.65% estimation process
2016 163,292 -0.26% estimation process
2017 162,942 -0.21% estimation process
2018 162,870 -0.04% estimation process
2019 162,436 -0.27% estimation process
2020 161,657 -0.48% estimation process

Comitatul Middlesex, Comte de Middlesex, Comté de Middlesex, Condado de Middlesex, Condado han Middlesex, Contae 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 er sai ke si jun, midalaseksa ka'unti, midorusekkusu jun, shhrstan mydlsks kntykt, Мидлсекс, Мидълсекс, Міддлсекс, Округ Мидлсекс, Միդլսեքս շրջան, شهرستان میدلسکس، کنتیکت, مڈلسکس کاؤنٹی, مڈلسیکس کاؤنٹی، کنیکٹیکٹ, মিডলসেক্স কাউন্টি, ミドルセックス郡, 米德爾塞克斯郡

People born in Middlesex County (1)

botanist (1867-1937) Duncan Starr Johnson was born in Middlesex County

Other places with the same name (4)

Connecticut Other Counties (more counties)

County Name Population Title
Fairfield County 942,426 County in Connecticut, United States
Hartford County 889,226 County in Connecticut, United States
New Haven County 851,948 County in Connecticut, United States
New London County 264,999 County in Connecticut, United States
Litchfield County 179,610 County in Connecticut, United States
Tolland County 150,600 County in Connecticut, United States
Bridgeport 143,525 The second most populous city in Connecticut.
Stamford 131,397 The second most populous city in Connecticut.
New Haven 130,801 The second most populous city in Connecticut.
North Stamford 128,278 A census-designated place in Stamford, Connecticut.
Hartford 121,535 The capital of Connecticut.
Windham County 116,540 County in Connecticut, United States
Waterbury 106,826 The second most populous city in Connecticut.
Norwalk 88,655 The most populous city in Fairfield County, Connecticut.
East Norwalk 84,530 A census-designated place in Norwalk, Connecticut.
Danbury 84,317 The most populous city in Fairfield County, Connecticut.