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| Component Change History |
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| Apr 1950 |
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| - | | Beverly city (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Danvers town (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Hamilton town (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Manchester town (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Marblehead town (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Middleton town (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Peabody city (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Salem city (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Swampscott town (in Essex County, MA) included as original component of Boston, MA SMA |
| - | | Wenham town (in Essex County, MA) included as original component of Boston, MA SMA |
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| Jun 1959 |
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| - | | Topsfield town (in Essex County, MA) added to Boston, MA SMSA |
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| Jun 1983 |
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| - | | New PMSA: Salem-Gloucester, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Beverly city (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Danvers town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Essex town (in Essex County, MA) included as original PMSA component |
| - | | Gloucester city (in Essex County, MA) included as original PMSA component |
| - | | Hamilton town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Ipswich town (in Essex County, MA) included as original PMSA component |
| - | | Manchester town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Marblehead town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Middleton town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Peabody city (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Rockport town (in Essex County, MA) included as original PMSA component |
| - | | Rowley town (in Essex County, MA) included as original PMSA component |
| - | | Salem city (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Swampscott town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Topsfield town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Wenham town (in Essex County, MA) included as original PMSA component, transferred from Boston, MA SMSA in Boston-Lawrence-Lowell, MA-NH SCSA |
| - | | Gloucester, MA designated as original central city of new PMSA |
| - | | Salem, MA designated as original central city of new PMSA |
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| Dec 1992 |
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| - | | Gloucester, MA transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA, designated as central city of PMSA |
| - | | Salem-Gloucester, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA abolished |
| - | | Beverly city (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Danvers town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Essex town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Gloucester city (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Hamilton town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Ipswich town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Manchester town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Marblehead town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Middleton town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Peabody city (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Rockport town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Rowley town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Salem city (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Swampscott town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Topsfield town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Wenham town (in Essex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Salem, MA 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 |
| - | | Gloucester, MA no longer designated as principal/central city of Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
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