|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)|
|Government||County government (abolished in 1960, except for County Sheriffs, which were abolished by an act of the state legislature effective in 2000)|
|Subdivisions||cities, towns, unincorporated communities, census designated place|
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 consists 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 of 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 purposes. Geographic boundaries of the former counties are still used by the state to organize its judicial and state marshal system. Connecticut's court jurisdictions still adhere to the county boundaries, and Fairfield, Hartford and New Haven Counties have been further subdivided into several smaller jurisdictions.
The FIPS county code is the five-digit Federal Information Processing Standard (FIPS) code which uniquely identifies counties and county equivalents in the United States. The three-digit number is unique to each individual county within a state, but to be unique within the entire United States, it must be prefixed by the state code. This means that, for example, while Fairfield County, Connecticut is 001, Belknap County, New Hampshire and Alachua County, Florida are also 001. To uniquely identify Fairfield County, Connecticut, one must use the state code of 09 plus the county code of 001; therefore, the unique nationwide identifier for Fairfield County, Connecticut is 09001. The links in the column FIPS county code are to the Census Bureau Info page for that county.
||FIPS code||County seat[a]||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 and Putnam||1726||From parts of Hartford and New London Counties||After Windham (now Wineham) in Sussex, England||118,428||513 sq mi