New Haven County
County
The New Haven Green Historic District
Location within the U.S. state of Connecticut
Connecticut's location within the U.S.
Coordinates: 41°21′N 72°54′W / 41.35°N 72.9°W / 41.35; -72.9
Country	United States
State	Connecticut
Founded	1666
Named for	New Haven Colony
Seat	none (since 1960) New Haven (before 1960)
Largest municipality	New Haven (population) Guilford (area)
Area
• Total	862 sq mi (2,230 km2)
• Land	605 sq mi (1,570 km2)
• Water	258 sq mi (670 km2)  29.9%
Population  (2020)[1]
• Total	864,835
• Density	1,429.5/sq mi (551.9/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)

New Haven County is a county in the US state of Connecticut. It is in the south central part of the state. The population was 864,835 in 2020.^[1] This made New Haven County the third most populated county in Connecticut. There are 1,340 people per square mile.^[2] Two of the state's largest cities, New Haven and Waterbury, are part of New Haven County.

Starting in 1960, county governments were no longer active. Until 1960, the city of New Haven was the county seat. In Connecticut, towns are responsible for all local government activities. This includes, fire and rescue, snow removal and schools. The county Sheriff plan was removed by voters. This was replaced by State Judicial Marshals in 2000. Because of this, the state judicial plan in New Haven County is divided into three districts: New Haven, Ansonia-Milford and Waterbury.

• Albertus Magnus College
• Gateway Community College
• Naugatuck Valley Community College
• Paier College of Art
• Post University
• Quinnipiac University
• Southern Connecticut State University
• University of New Haven
• University of Connecticut - Waterbury
• Yale University

• New Haven County Cutters

• Stewart B. McKinney National Wildlife Refuge

• New Haven County Sheriff's Department
• New Haven County Marshals Association Archived 2009-01-21 at the Wayback Machine

41°21′N 72°54′W / 41.35°N 72.90°W / 41.35; -72.90

v t e New York metropolitan area
Counties	Bergen Bronx Carbon Dutchess Essex Fairfield Hudson Hunterdon Kings Lehigh Litchfield Mercer Middlesex Monmouth Monroe Morris Nassau New Haven Northampton New York Ocean Orange Passaic Pike Putnam Queens Richmond Rockland Somerset Suffolk Sussex Sullivan Ulster Union Warren Westchester
Major cities and towns	New York City The Bronx Brooklyn Manhattan Queens Staten Island Hempstead
Cities over 100,000	Allentown Bridgeport Edison Elizabeth Huntington Jersey City New Haven Newark Paterson Stamford Waterbury Woodbridge Yonkers
Cities and towns over 25,000	Bayonne Bergenfield Bethlehem Branford Cheshire Clifton Danbury East Haven East Orange Easton Englewood Ewing Township Fairfield Fair Lawn Fort Lee Freehold Township Garfield Greenwich Hackensack Hamden Hamilton Township, Mercer County Hoboken Howell Kearny Long Beach Long Branch Lower Macungie Township Mahwah Manalapan Marlboro Meriden Middletown, NJ Middletown, NY Milford Mount Vernon Naugatuck New Brunswick New Milford New Rochelle Newburgh Newtown Norwalk Old Bridge Paramus Passaic Perth Amboy Plainfield Poughkeepsie Rahway Shelton Stratford Teaneck Torrington Trenton Trumbull Union City Wallingford West Haven Westfield Westport White Plains Whitehall Township, PA
Cities and towns over 10,000	Ansonia Asbury Park Beacon Bethel Bethlehem Township, PA Brookfield Coolbaugh Township Darien Derby Dover Dumont East Stroudsburg Edgewater Elmwood Park Emmaus, PA Fairview Franklin Lakes Freehold Borough Glen Rock Guildford Guttenberg Harrison, NJ Harrison, NY Hasbrouck Heights Hazlet Hillsdale Holmdel Kingston Linden Little Ferry Lodi Lyndhurst Madison Monroe Morristown New Canaan New Fairfield New Milford North Arlington North Branford North Haven Northampton, PA Oakland Orange Palisades Park Phillipsburg Plymouth Peekskill Ramsey Red Bank Ridgefield, CT Ridgefield, NJ Ridgefield Park Ridgewood Rutherford Rye Saddle Brook Scarsdale Secaucus Seymour Somerville Southbury Stroud Township Summit Tenafly Upper Macungie Township Wallington Watertown, CT West Milford West New York Weston Westwood Wilton Winchester Wolcott Wyckoff
Regions	Catskills Central Jersey Greater Danbury Greater New Haven Greater Waterbury Hudson Valley Lehigh Valley Litchfield Hills Long Island North Jersey Poconos Skylands Region Southwestern Connecticut

v t e Municipalities and communities of New Haven County, Connecticut, United States
County seat: New Haven
Cities	Ansonia Derby Meriden Milford New Haven Waterbury West Haven
Towns	Beacon Falls Bethany Branford Cheshire East Haven Guilford Hamden Madison Middlebury North Branford North Haven Orange Oxford Prospect Seymour Southbury Wallingford Wolcott Woodbridge
Boroughs	Naugatuck* Woodmont *Consolidated borough and town
CDPs	Branford Center Cheshire Village Guilford Center Heritage Village Madison Center Northford Quinnipiac University Wallingford Center
Other communities	Places in Waterbury Devon Fair Haven Quaker Farms Short Beach South Britain Stony Creek Twin Lakes Westville Yalesville

v t e State of Connecticut
Hartford (capital)
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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