Middlesex County
County of Connecticut
Raymond E Baldwin Courthouse
Location within the U.S. state of Connecticut
Connecticut's location within the U.S.
Coordinates: 41°26′N 72°31′W / 41.44°N 72.52°W / 41.44; -72.52
Country	United States
State	Connecticut
Founded	May, 1785
Named for	Middlesex, England
Seat	none (since 1960) Middletown (before 1960)
Largest city	Middletown
Area
• Total	439 sq mi (1,140 km2)
• Land	369 sq mi (960 km2)
• Water	70 sq mi (200 km2)  15.9%
Population  (2020)[1]
• Total	164,245
• Density	370/sq mi (140/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)

Middlesex County is located in the south central part of the U.S. State of Connecticut. As of the 2020 census, the population was 164,245.^[1] The county has a total area of 1,137 km² (439 mi²). 956 km² (369 mi²) of it is land and 181 km² (70 mi²) of it is water. The total area is 15.90% water.

• Chester Center
• Chester
• Clinton
• Cromwell
• Deep River Center
• Deep River
• Durham
• East Haddam
• East Hampton
• Essex Village
• Essex
• Fenwick
• Haddam
• Higganum
• Killingworth
• Lake Pocotopaug
• Middlefield
• Middletown
• Moodus
• Old Saybrook Center
• Old Saybrook
• Portland
• Saybrook Manor
• Westbrook Center
• Westbrook

v t e Municipalities and communities of Middlesex County, Connecticut, United States
County seat: Middletown
City	Middletown
Towns	Chester Clinton Cromwell Deep River Durham East Haddam East Hampton Essex Haddam Killingworth Middlefield Old Saybrook Portland Westbrook
Borough	Fenwick
CDPs	Chester Center Clinton Deep River Center Durham East Hampton Essex Village Higganum Lake Pocotopaug Moodus Old Saybrook Center Portland Saybrook Manor Westbrook Center
Other communities	Centerbrook Hidden Lake Ivoryton Leesville Middle Haddam Millington

v t e State of Connecticut
Hartford (capital)
Topics	Index Geography Government History People
Society	Demographics Economy Education
Counties	Fairfield Hartford Litchfield Middlesex New Haven New London Tolland Windham
Cities	Ansonia Bridgeport Bristol Danbury Derby Groton Hartford Meriden Middletown Milford New Britain New Haven New London Norwalk Norwich Shelton Stamford Torrington Waterbury West Haven
All Towns	Andover Ansonia Ashford Avon Barkhamsted Beacon Falls Berlin Bethany Bethel Bethlehem Bloomfield Bolton Bozrah Branford Bridgeport Bridgewater Bristol Brookfield Brooklyn Burlington Canaan Canterbury Canton Chaplin Cheshire Chester Clinton Colchester Colebrook Columbia Cornwall Coventry Cromwell Danbury Darien Deep River Derby Durham East Granby East Haddam East Hampton East Hartford East Haven East Lyme East Windsor Eastford Easton Ellington Enfield Essex Fairfield Farmington Franklin Glastonbury Goshen Granby Greenwich Griswold Groton Guilford Haddam Hamden Hampton Hartford Hartland Harwinton Hebron Hartford Kent Killingly Killingworth Lebanon Ledyard Lisbon Litchfield Lyme Madison Manchester Mansfield Marlborough Meriden Middlebury Middlefield Middletown Milford Monroe Montville Morris Naugatuck New Britain New Canaan New Fairfield New Hartford New Haven New London New Milford Newington Newtown Norfolk North Branford North Canaan North Haven North Stonington Norwalk Norwich Old Lyme Old Saybrook Orange Oxford Plainfield Plainville Plymouth Pomfret Portland Preston Prospect Putnam Redding Ridgefield Rocky Hill Roxbury Salem Salisbury Scotland Seymour Sharon Shelton Sherman Simsbury Somers South Windsor Southbury Southington Sprague Stafford Stamford Sterling Stonington Stratford Suffield Thomaston Thompson Tolland Torrington Trumbull Union Vernon Voluntown Wallingford Warren Washington Waterbury Waterford Watertown West Hartford West Haven Westbrook Weston Westport Wethersfield Willington Wilton Winchester Windham Windsor Windsor Locks Wolcott Woodbridge Woodbury Woodstock

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