Hartford County is a county located in the north central part of the U.S. state of Connecticut. According to the 2020 census, the population was 899,498, making it the second-most populous county in Connecticut. Hartford County contains the city of Hartford, the state capital of Connecticut and the county's most populous city, with 121,054 residents at the 2020 census. Hartford County is included in the Hartford-East Hartford-Middletown metropolitan statistical area.
New Haven County is a county in the south central part of the U.S. state of Connecticut. As of the 2020 census, the population was 864,835, making it the third-most populous county in Connecticut. Two of the state's five largest cities, New Haven (3rd) and Waterbury (5th), are part of New Haven County.
New London County is a county in the southeastern corner of Connecticut and comprises the Norwich-New London, Connecticut Metropolitan Statistical Area, which is also included in the Hartford-East Hartford, Connecticut Combined Statistical Area. There is no county government and no county seat, as is the case with all eight of Connecticut's counties; towns are responsible for all local government activities, including fire and rescue, snow removal, and schools.
Tolland County is a county in the northeastern part of the U.S. state of Connecticut. As of the 2020 census, its population was 149,788. It is incorporated into 13 towns and was originally formed on October 13, 1785, from portions of eastern Hartford County and western Windham County.
Windham County is one of the eight historical counties in the U.S. state of Connecticut, located in its northeastern corner. As of the 2020 census, the population was 116,418, making it the least populous county in Connecticut. It forms the core of the region known as the Quiet Corner. Windham County is included in the Worcester, MA-CT Metropolitan Statistical Area, which is also included in the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area. The entire county is within the Quinebaug and Shetucket Rivers Valley National Heritage Corridor, as designated by the National Park Service.
In the United States, a county or county equivalent is an administrative or political subdivision of a U.S. state or other territories of the United States which consists of a geographic area with specific boundaries and usually some level of governmental authority. The term "county" is used in 48 states, while Louisiana and Alaska have functionally equivalent subdivisions called parishes and boroughs, respectively. The specific governmental powers of counties vary widely between the states, with many providing some level of services to civil townships, municipalities, and unincorporated areas. Certain municipalities are in multiple counties; New York City is uniquely partitioned into five counties, referred to at the city government level as boroughs. Some municipalities have been consolidated with their county government to form consolidated city-counties, or have been legally separated from counties altogether to form independent cities. Conversely, counties in Connecticut, Rhode Island, eight of Massachusetts's 14 counties, and Alaska's Unorganized Borough have no government power, existing only as geographic distinctions.
The Northeastern United States, also referred to as the Northeast, the East Coast, or the American Northeast, is a geographic region of the United States located on the Atlantic coast of North America. It borders Canada to its north, the Southern United States to its south, the Midwestern United States to its west, and the Atlantic Ocean to its east.
Connecticut shares with the five other New England states a governmental structure known as the New England town. From 1666 to 1960, Connecticut had a system of county governments, which each had limited powers given to it by the General Assembly. They were abolished by Public Act 152 in 1960. Connecticut also had a system of sheriffs' offices until October 2000, when those were also abolished.
In Connecticut, councils of governments, also known as COGs, are regional planning organizations that bring together the chief elected officials or professional managers from member municipalities in Connecticut. Since 2015 and 2022, the Connecticut planning regions served by COGs have been recognized as county equivalents under state and federal law respectively, superseding the eight legacy counties in the state for most federal funding and statistical purposes.
The Capitol Planning Region is a planning region and county-equivalent in Connecticut. It is served by the coterminous Capitol Region Council of Governments (CRCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
The Greater Bridgeport Planning Region is a planning region and county-equivalent in Connecticut. It is served by the coterminous Connecticut Metropolitan Council of Governments (MetroCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
The Lower Connecticut River Valley Planning Region is a planning region and county-equivalent in Connecticut. It is served by the coterminous Lower Connecticut River Valley Council of Governments (RiverCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
The Naugatuck Valley Planning Region is a planning region and county-equivalent in Connecticut. It is served by the coterminous Naugatuck Valley Council of Governments (NVCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
The Northwest Hills Planning Region is a planning region and county-equivalent in Connecticut, United States. It is served by the coterminous Northwest Hills Council of Governments (NHCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
The South Central Connecticut Planning Region is a planning region in the Councils of governments in Connecticut and a county-equivalent in Connecticut. It is served by the coterminous South Central Regional Council of Governments (SCRCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
The Southeastern Connecticut Planning Region is a planning region and county-equivalent in Connecticut. It is served by the coterminous Southeastern Connecticut Council of Governments (SCCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
The Western Connecticut Planning Region is a planning region and county-equivalent in Connecticut. It is served by the coterminous Western Connecticut Council of Governments (WestCOG), one of nine regional councils of governments in Connecticut. Within the region, there are two Metropolitan Planning Organizations, South Western CT MPO and the Housatonic Valley MPO.
United States
Connecticut 
