|Counties of Connecticut|
|Location||State of Connecticut|
|Populations||118,428 (Windham) – 916,829 (Fairfield)|
|Areas||369 square miles (960 km2) (Middlesex) – 920 square miles (2,400 km2) (Litchfield)|
Four of the counties – Fairfield, Hartford, New Haven and New London – were created in 1666, shortly after the Connecticut Colony and the New Haven Colony combined. Windham and Litchfield Counties were created later in the colonial era, while Middlesex and Tolland Counties were created after American independence (both in 1785). Six of the counties are named for locations in England, where many early Connecticut settlers originated.
Although Connecticut is divided into counties, there is no county government in Connecticut, and local government exists solely on the municipality level. Almost all functions of county government were abolished in Connecticut in 1960, except for elected county sheriffs and their departments under them. Those offices and their departments were abolished by an act of the state legislature effective in December 2000. The functions the county sheriffs' departments played were assumed by the newly organized State Marshal Commission and the state Department of Corrections.
Connecticut's legacy county names remain for geographical and statistical purposes. Counties serve mainly as dividing lines for the state's judicial and state marshal system. However, the three largest counties–Fairfield, Hartford and New Haven–have been further subdivided into several smaller jurisdictions.
||FIPS code||County seat[b]||Est.||Origin||Etymology||Population||Area||Map|
|Fairfield County||001||Bridgeport||1666||original county||From the hundreds of acres of salt marsh that bordered the coast.||916,829||626 sq mi
|Hartford County||003||Hartford||1666||original county||After the county of Hertfordshire in the UK||894,014||736 sq mi
|Litchfield County||005||Litchfield||1751||From parts of Fairfield, Hartford and New Haven Counties||City of Lichfield in the UK||189,927||920 sq mi
|Middlesex County||007||Middletown||1785||From parts of Hartford and New London Counties||Former county of Middlesex in the UK||165,676||369 sq mi
|New Haven County||009||New Haven||1666||original county||After New Haven Colony, founded as a haven in which Puritans could be free from persecution.||862,477||606 sq mi
|New London County||011||New London||1666||original county||After London, UK||274,055||666 sq mi
|Tolland County||013||Rockville||1785||From parts of Hartford and Windham Counties||Hamlet of Tolland, Somerset, UK||152,691||410 sq mi
|Windham County||015||Willimantic||1726||From parts of Hartford and New London Counties||After Windham (now Wineham) in Sussex, England||118,428||513 sq mi
- Trumbull County, Ohio – The Connecticut Western Reserve, ceded to Ohio in 1800.
- Westmoreland County, Connecticut – An area around Wilkes-Barre, ceded to Pennsylvania in 1784.
- Clark, George Larkin (1914). A History of Connecticut: Its People and Institutions. G. P. Putnam's Sons. p. 1.
a history of Connecticut.
- An Overview of County Government Archived July 8, 2008, at the Wayback Machine, National Association of Counties website, accessed January 5, 2008
- https://www.cga.ct.gov/PS98/rpt%5Colr%5Chtm/98-R-0086.htm#:~:text=Because%20the%20state%20and%20local,a%20viable%20source%20of%20government. "Because the state and local governments had historically wielded substantial authority within Connecticut, county governments never achieved the authority needed to gain a stronghold as a viable source of government."
- "State Marshals Directory - CT Judicial Branch".
- "Connecticut Judicial District Map". jud.ct.gov. Retrieved February 24, 2021.
- "Change to County Equivalents in the State of Connecticut". Federal Register. December 14, 2020. Retrieved February 24, 2021.
- "Proposed Change to County Equivalents in Connecticut" (PDF). US Census Bureau.
- "EPA County FIPS Code Listing". EPA.gov. Archived from the original on October 7, 2012. Retrieved February 23, 2008.
- "Connecticut State Register and Manual, Section VI: Counties". Connecticut Official State Website (Office of Secretary of State).
- National Association of Counties. "NACo – Find a county". Archived from the original on September 27, 2007. Retrieved April 30, 2008.
- Beatty, Michael (2001). County Name Origins of the United States. McFarland Press. ISBN 0-7864-1025-6.
- "Connecticut QuickFacts". U.S. Census Bureau. Archived from the original on December 4, 2013. Retrieved July 17, 2007.