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| Component Change History |
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| Apr 1950 |
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| - | | New SMA: Brockton, MA SMA |
| - | | Easton town (in Bristol County, MA) included as original SMA component |
| - | | Avon town (in Norfolk County, MA) included as original SMA component |
| - | | Holbrook town (in Norfolk County, MA) included as original SMA component |
| - | | Stoughton town (in Norfolk County, MA) included as original SMA component |
| - | | Abington town (in Plymouth County, MA) included as original SMA component |
| - | | Bridgewater town (in Plymouth County, MA) included as original SMA component |
| - | | Brockton city (in Plymouth County, MA) included as original SMA component |
| - | | East Bridgewater town (in Plymouth County, MA) included as original SMA component |
| - | | Rockland town (in Plymouth County, MA) included as original SMA component |
| - | | West Bridgewater town (in Plymouth County, MA) included as original SMA component |
| - | | Whitman town (in Plymouth County, MA) included as original SMA component |
| - | | Brockton, MA designated as original central city of new SMA |
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| Jun 1959 |
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| - | | Holbrook town (in Norfolk County, MA) transferred to Boston, MA SMSA |
| - | | Hanson town (in Plymouth County, MA) added |
| - | | Rockland town (in Plymouth County, MA) transferred to Boston, MA SMSA |
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| Apr 1973 |
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| - | | Stoughton town (in Norfolk County, MA) transferred to Boston, MA SMSA |
| - | | Abington town (in Plymouth County, MA) transferred to Boston, MA SMSA |
| - | | Halifax town (in Plymouth County, MA) added |
| - | | Hanson town (in Plymouth County, MA) transferred to Boston, MA SMSA |
| - | | Lakeville town (in Plymouth County, MA) added to New Bedford, MA SMSA |
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| Oct 1975 |
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| - | | Brockton, MA SMSA included in Boston-Lawrence-Lowell, MA-NH SCSA |
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| Jun 1983 |
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| - | | Brockton, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA became Brockton, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Raynham town (in Bristol County, MA) added to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Abington town (in Plymouth County, MA) added, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Lakeville town (in Plymouth County, MA) added to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA, transferred from New Bedford, MA SMSA |
| - | | Middleborough town (in Plymouth County, MA) added to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Plympton town (in Plymouth County, MA) added to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
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| Dec 1992 |
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| - | | Raynham town (in Bristol County, MA) added, transferred from Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Hanson town (in Plymouth County, MA) added, transferred from Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Lakeville town (in Plymouth County, MA) added, transferred from Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Middleborough town (in Plymouth County, MA) added, transferred from Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Plympton town (in Plymouth County, MA) added, transferred from Boston, MA PMSA in Boston-Lawrence-Salem, 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 |
| - | | Brockton, MA PMSA in Boston-Worcester-Lawrence, MA-NH CMSA abolished |
| - | | Brockton, MA no longer designated as principal/central city |
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