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.
Middlesex County is a county in the south central part of the U.S. state of Connecticut. As of the 2020 census, the population was 164,245. The county was created in May 1785 from portions of Hartford County and New London 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.
East Haddam is a town in Middlesex County, Connecticut, United States. The town is part of the Lower Connecticut River Valley Planning Region. The population was 8,875 at the time of the 2020 census.
Haddam is a town in Middlesex County, Connecticut, United States. The town is part of the Lower Connecticut River Valley Planning Region. The population was 8,452 at the time of the 2020 census. It is the only town in Connecticut that the Connecticut River runs through the middle of instead of at the town's border edge. The town was also home to the now-decommissioned Connecticut Yankee Nuclear Power Plant.
Killingworth is a town in Middlesex County, Connecticut, United States. The town is part of the Lower Connecticut River Valley Planning Region. The population was 6,174 at the 2020 United States Census.
Lyme is a town in New London County, Connecticut, United States, situated on the eastern side of the Connecticut River. The town is part of the Lower Connecticut River Valley Planning Region. The population was 2,352 at the 2020 census. Lyme is the eponym of Lyme disease.
The Lower Connecticut River Valley is a region of the state of Connecticut around the juncture where the Connecticut River meets Long Island Sound. It includes towns in Middlesex County and the western edge of New London County. It is located in the southeastern-central part of the state and includes the seventeen towns of Chester, Clinton, Cromwell, Deep River, Durham, East Haddam, East Hampton, Essex, Haddam, Killingworth, Lyme, Middlefield, Middletown, Old Lyme, Old Saybrook, Portland and Westbrook.
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 Northeastern Connecticut Planning Region is a planning region and county-equivalent in Connecticut. It is served by the coterminous Northeastern Connecticut Council of Governments (NECCOG). In 2022, planning regions were approved to replace Connecticut's counties as county-equivalents for statistical purposes, with full implementation occurring by 2024.
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 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 
