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| Component Change History |
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| Jun 1959 |
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| - | | Cromwell town (in Middlesex County, CT) added to Hartford, CT SMSA |
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| Apr 1973 |
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| - | | East Hampton town (in Middlesex County, CT) added to Hartford, CT SMSA |
| - | | Portland town (in Middlesex County, CT) added to Hartford, CT SMSA |
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| Jun 1983 |
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| - | | New PMSA: Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA |
| - | | Cromwell town (in Middlesex County, CT) included as original PMSA component, transferred from Hartford, CT SMSA |
| - | | Durham town (in Middlesex County, CT) included as original PMSA component |
| - | | East Hampton town (in Middlesex County, CT) included as original PMSA component, transferred from Hartford, CT SMSA |
| - | | Haddam town (in Middlesex County, CT) included as original PMSA component |
| - | | Middlefield town (in Middlesex County, CT) included as original PMSA component |
| - | | Middletown city (in Middlesex County, CT) included as original PMSA component |
| - | | Portland town (in Middlesex County, CT) included as original PMSA component, transferred from Hartford, CT SMSA |
| - | | Middletown, CT designated as original central city of new PMSA |
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| Dec 1992 |
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| - | | Middletown, CT transferred to Hartford, CT MSA, designated as central city of MSA |
| - | | Middletown, CT PMSA in Hartford-New Britain-Middletown, CT CMSA abolished |
| - | | Cromwell town (in Middlesex County, CT) transferred to Hartford, CT MSA |
| - | | Durham town (in Middlesex County, CT) transferred to Hartford, CT MSA |
| - | | East Hampton town (in Middlesex County, CT) transferred to Hartford, CT MSA |
| - | | Haddam town (in Middlesex County, CT) transferred to Hartford, CT MSA |
| - | | Middlefield town (in Middlesex County, CT) transferred to Hartford, CT MSA |
| - | | Middletown city (in Middlesex County, CT) transferred to Hartford, CT MSA |
| - | | Portland town (in Middlesex County, CT) transferred to Hartford, CT 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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