Middlesex County is a county in the south central part of the U.S. state of Connecticut. As of the 2020 census, the population was 164,245. The county was created in May 1785 from portions of Hartford County and New London County. Middlesex County is included in the Hartford-East Hartford-Middletown metropolitan statistical area known as Greater Hartford. As with all eight of Connecticut's counties, there is now no county government and no county seat. In Connecticut, towns are responsible for all local government activities, including local police, fire and rescue, snow removal, and schools. In a few cases, neighboring towns will share certain resources, e.g. water, gas, etc. On June 6, 2022, the U.S. Census Bureau formally recognized Connecticut's nine councils of governments as county equivalents instead of the state's eight counties. Connecticut's county governments were disbanded in 1960, and the councils of governments took over some of the local governmental functions.

Founded: May, 1785
Named for: Middlesex, England
Seat: none (since 1960), Middletown (before 1960)
Largest city: Middletown
Total: 439 sq mi (1,137 km²)
Land: 369 sq mi (955.71 km²)
Water: 70 sq mi (181.3 km²), 15.9%
Density: 370/sq mi (/km²)
Time zone: Eastern: UTC-5-4
Wikidata description: county in Connecticut, United States
Wikidata id: Q54238
Wikidata label: Middlesex County
Wikidata aliases: Array
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