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| Component Change History |
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| Apr 1950 |
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| - | | New SMA: New Bedford, MA SMA |
| - | | Acushnet town (in Bristol County, MA) included as original SMA component |
| - | | Dartmouth town (in Bristol County, MA) included as original SMA component |
| - | | Fairhaven town (in Bristol County, MA) included as original SMA component |
| - | | New Bedford city (in Bristol County, MA) included as original SMA component |
| - | | New Bedford, MA designated as original central city of new SMA |
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| Jun 1959 |
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| - | | Marion town (in Plymouth County, MA) added |
| - | | Mattapoisett town (in Plymouth County, MA) added |
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| Apr 1973 |
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| - | | Freetown town (in Bristol County, MA) added |
| - | | Lakeville town (in Plymouth County, MA) added |
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| Jun 1983 |
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| - | | Lakeville town (in Plymouth County, MA) transferred to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Rochester town (in Plymouth County, MA) added |
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| Dec 1992 |
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| - | | New Bedford, MA transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA, designated as central city of PMSA |
| - | | New Bedford, MA MSA abolished |
| - | | Acushnet town (in Bristol County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Dartmouth town (in Bristol County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Fairhaven town (in Bristol County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Freetown town (in Bristol County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | New Bedford city (in Bristol County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Lakeville town (in Plymouth County, MA) added to Brockton, MA PMSA in Boston-Worcester-Lawrence, MA-NH CMSA, transferred from Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Marion town (in Plymouth County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Mattapoisett town (in Plymouth County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Rochester town (in Plymouth County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
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| Jun 1993 |
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| - | | PMSA reestablished: New Bedford, MA PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Acushnet town (in Bristol County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Dartmouth town (in Bristol County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Fairhaven town (in Bristol County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Freetown town (in Bristol County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | New Bedford city (in Bristol County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Marion town (in Plymouth County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Mattapoisett town (in Plymouth County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Rochester town (in Plymouth County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | New Bedford, MA designated as original central city of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
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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 |
| - | | New Bedford, MA PMSA in Boston-Worcester-Lawrence, MA-NH CMSA abolished |
| - | | New Bedford, MA transferred to Providence-New Bedford-Fall River, RI-MA Metro Area, designated as principal city of Metro Area |
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