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| Component Change History |
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| Apr 1950 |
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| - | | New SMA: Hartford, CT SMA |
| - | | Avon town (in Hartford County, CT) included as original SMA component |
| - | | Bloomfield town (in Hartford County, CT) included as original SMA component |
| - | | East Hartford town (in Hartford County, CT) included as original SMA component |
| - | | Enfield town (in Hartford County, CT) included as original component of Springfield-Holyoke, MA-CT SMA |
| - | | Farmington town (in Hartford County, CT) included as original SMA component |
| - | | Glastonbury town (in Hartford County, CT) included as original SMA component |
| - | | Hartford city and town (in Hartford County, CT) included as original SMA component |
| - | | Manchester town (in Hartford County, CT) included as original SMA component |
| - | | Newington town (in Hartford County, CT) included as original SMA component |
| - | | Rocky Hill town (in Hartford County, CT) included as original SMA component |
| - | | Simsbury town (in Hartford County, CT) included as original SMA component |
| - | | South Windsor town (in Hartford County, CT) included as original SMA component |
| - | | West Hartford town (in Hartford County, CT) included as original SMA component |
| - | | Wethersfield town (in Hartford County, CT) included as original SMA component |
| - | | Windsor town (in Hartford County, CT) included as original SMA component |
| - | | Hartford, CT designated as original central city of new SMA |
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| Jun 1959 |
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| - | | Canton town (in Hartford County, CT) added |
| - | | East Windsor town (in Hartford County, CT) added |
| - | | Enfield town (in Hartford County, CT) added, transferred from Springfield-Holyoke, MA-CT SMA |
| - | | Suffield town (in Hartford County, CT) added |
| - | | Windsor Locks town (in Hartford County, CT) added |
| - | | Cromwell town (in Middlesex County, CT) added |
| - | | Vernon town (in Tolland County, CT) added |
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| Oct 1963 |
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| - | | East Granby town (in Hartford County, CT) added |
| - | | Granby town (in Hartford County, CT) added |
| - | | Andover town (in Tolland County, CT) added |
| - | | Bolton town (in Tolland County, CT) added |
| - | | Coventry town (in Tolland County, CT) added |
| - | | Ellington town (in Tolland County, CT) added |
| - | | Somers town (in Tolland County, CT) added to Springfield-Chicopee-Holyoke, MA-CT SMSA |
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| Apr 1973 |
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| - | | Marlborough town (in Hartford County, CT) added |
| - | | New Hartford town (in Litchfield County, CT) added |
| - | | East Hampton town (in Middlesex County, CT) added |
| - | | Portland town (in Middlesex County, CT) added |
| - | | Colchester town (in New London County, CT) added |
| - | | Columbia town (in Tolland County, CT) added |
| - | | Hebron town (in Tolland County, CT) added |
| - | | Stafford town (in Tolland County, CT) added |
| - | | Tolland town (in Tolland County, CT) added |
| - | | Willington town (in Tolland County, CT) added |
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| Jun 1983 |
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| - | | Hartford, CT SMSA became Hartford, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | Barkhamsted town (in Litchfield County, CT) added |
| - | | Cromwell town (in Middlesex County, CT) included as original component of Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | East Haddam town (in Middlesex County, CT) added |
| - | | East Hampton town (in Middlesex County, CT) included as original component of Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | Portland town (in Middlesex County, CT) included as original component of Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | Somers town (in Tolland County, CT) added, transferred from Springfield-Chicopee-Holyoke, MA-CT SMSA |
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| Dec 1992 |
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| - | | Hartford, CT PMSA in Hartford-New Britain-Middletown, CT CMSA abolished |
| - | | Avon town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Bloomfield town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Canton town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | East Granby town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | East Hartford town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | East Windsor town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Enfield town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Farmington town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Glastonbury town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Granby town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Hartford city and town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Manchester town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Marlborough town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Newington town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Rocky Hill town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Simsbury town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | South Windsor town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Suffield town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | West Hartford town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Wethersfield town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Windsor town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Windsor Locks town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Barkhamsted town (in Litchfield County, CT) transferred to Hartford, CT MSA |
| - | | New Hartford town (in Litchfield County, CT) transferred to Hartford, CT MSA |
| - | | Cromwell town (in Middlesex County, CT) added to Hartford, CT MSA, transferred from Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | East Haddam town (in Middlesex County, CT) transferred to Hartford, CT MSA |
| - | | East Hampton town (in Middlesex County, CT) added to Hartford, CT MSA, transferred from Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | Portland town (in Middlesex County, CT) added to Hartford, CT MSA, transferred from Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | Colchester town (in New London County, CT) transferred to Hartford, CT MSA |
| - | | Andover town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Bolton town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Columbia town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Coventry town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Ellington town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Hebron town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Somers town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Stafford town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Tolland town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Vernon town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Willington town (in Tolland County, CT) transferred to Hartford, CT MSA |
| - | | Hartford, CT transferred to Hartford, CT MSA, designated as central city of MSA |
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| Jun 2003 |
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| - | | Counties instead of cities and towns became the basic geographic unit of core based statistical areas in New England |
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