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| Component Change History |
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| Apr 1950 |
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| - | | New SMA: New Britain-Bristol, MA SMA |
| - | | Berlin town (in Hartford County, CT) included as original SMA component |
| - | | Bristol town (in Hartford County, CT) included as original SMA component |
| - | | New Britain city and town (in Hartford County, CT) included as original SMA component |
| - | | Plainville town (in Hartford County, CT) included as original SMA component |
| - | | Southington town (in Hartford County, CT) included as original SMA component |
| - | | Plymouth town (in Litchfield County, CT) included as original SMA component |
| - | | Bristol, CT designated as original central city of new SMA |
| - | | New Britain, CT designated as original central city of new SMA |
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| Jun 1959 |
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| - | | Title of New Britain-Bristol, MA SMA changed to New Britain, MA SMSA |
| - | | Bristol town (in Hartford County, CT) deleted, reverted to nonmetro status |
| - | | Plymouth town (in Litchfield County, CT) deleted, reverted to nonmetro status |
| - | | Bristol, CT no longer designated as central city |
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| Feb 1971 |
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| - | | Bristol, CT designated as original central city of new Bristol, CT SMSA |
| - | | Bristol town (in Hartford County, CT) included as original component of Bristol, CT SMSA |
| - | | Plymouth town (in Litchfield County, CT) included as original component of Bristol, CT SMSA |
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| Jun 1983 |
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| - | | New Britain, MA SMSA became New Britain, MA PMSA in Hartford-New Britain-Middletown, CT CMSA |
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| Dec 1992 |
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| - | | New Britain, MA PMSA in Hartford-New Britain-Middletown, CT CMSA abolished |
| - | | Berlin town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Bristol town (in Hartford County, CT) added to Hartford, CT MSA, transferred from Bristol, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | New Britain city and town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Plainville town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Southington town (in Hartford County, CT) transferred to Hartford, CT MSA |
| - | | Plymouth town (in Litchfield County, CT) added to Hartford, CT MSA, transferred from Bristol, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | Bristol, CT no longer designated as central city of Bristol, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | New Britain, CT no longer designated as central city |
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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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