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Welcome to Middlesex County ...

Time Zone: Middlesex County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time.

Middlesex County was founded in 1785 and was created by taking area from Hartford County.

From the Census Estimates for 2019, <1> Middlesex had a population of 162,436 people. This is a decrease of 1.92% since the last Census (which gave a population of 165,616 people in 2010).

At the time of the 2010 Census, Middlesex represented 4.63% of the total population of Connecticut.

Below are some of the communities located in Middlesex County:

  • Chester
    (4 miles [6.4 km] to the southeast)
    • Chester is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for Chester
    • Population from the 2020 Census: 4,175 people
  • Clinton
    (10 miles [16.1 km] to the south)
    • Clinton is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for Clinton
    • Population from the 2020 Census: 12,881 people
  • Cromwell
    (12 miles [19.3 km] to the northwest)
    • Cromwell is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for Cromwell
    • Population from the 2020 Census: 13,772 people
  • Deep River
    (6 miles [9.7 km] to the southeast)
    • Deep River is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for Deep River
    • Population from the 2020 Census: 4,419 people
  • Durham
    (7 miles [11.3 km] to the west)
    • Durham is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for Durham
    • Population from the 2020 Census: 7,137 people
  • East Haddam
    (7 miles [11.3 km] to the east)
    • East Haddam is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for East Haddam
    • Population from the 2020 Census: 8,956 people
  • East Hampton
    (8 miles [12.9 km] to the north)
    • East Hampton is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for East Hampton
    • Population from the 2020 Census: 12,747 people
  • Essex
    (9 miles [14.5 km] to the southeast)
    • Essex is located in Middlesex County (CT)
    • Jump to our Gazetteer entry for Essex
    • Population from the 2020 Census: 6,634 people
  • Continue List   (8 more) ...
    • Haddam
      (Less than 2 miles to the north)
      • Haddam is located in Middlesex County (CT)
      • Jump to our Gazetteer entry for Haddam
      • Population from the 2020 Census: 8,150 people
    • Killingworth
      (5 miles [8 km] to the south)
      • Killingworth is located in Middlesex County (CT)
      • Jump to our Gazetteer entry for Killingworth
      • Population from the 2020 Census: 6,340 people
    • Middlefield
      (10 miles [16.1 km] to the northwest)
      • Middlefield is located in Middlesex County (CT)
      • Jump to our Gazetteer entry for Middlefield
      • Population from the 2020 Census: 4,350 people
    • Middletown
      (9 miles [14.5 km] to the northwest)
      • Middletown is located in Middlesex County (CT)
      • Jump to our Gazetteer entry for Middletown
      • Population from the 2020 Census: 46,013 people
    • Old Saybrook
      (13 miles [20.9 km] to the southeast)
      • Old Saybrook is located in Middlesex County (CT)
      • Jump to our Gazetteer entry for Old Saybrook
      • Population from the 2020 Census: 10,028 people
    • Portland
      (10 miles [16.1 km] to the north)
      • Portland is located in Middlesex County (CT)
      • Jump to our Gazetteer entry for Portland
      • Population from the 2020 Census: 9,213 people
    • Westbrook
      (11 miles [17.7 km] to the south)
      • Westbrook is located in Middlesex County (CT)
      • Jump to our Gazetteer entry for Westbrook
      • Population from the 2020 Census: 6,842 people

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.