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| Component Change History |
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| Jun 1959 |
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| - | | New SMSA: Fitchburg-Leominster, MA SMSA |
| - | | Shirley town (in Middlesex County, MA) included as original SMSA component |
| - | | Fitchburg city (in Worcester County, MA) included as original SMSA component |
| - | | Leominster city (in Worcester County, MA) included as original SMSA component |
| - | | Lunenburg town (in Worcester County, MA) included as original SMSA component |
| - | | Fitchburg, MA designated as original central city of new SMSA |
| - | | Leominster, MA designated as original central city of new SMSA |
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| Oct 1963 |
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| - | | Townsend town (in Middlesex County, MA) added |
| - | | Westminster town (in Worcester County, MA) added |
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| Jun 1983 |
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| - | | Ashby town (in Middlesex County, MA) added |
| - | | Shirley town (in Middlesex County, MA) transferred to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Townsend town (in Middlesex County, MA) transferred to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Ashburnham town (in Worcester County, MA) added |
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| Dec 1992 |
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| - | | Fitchburg, MA transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA, designated as central city of PMSA |
| - | | Leominster, MA transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA, designated as central city of PMSA |
| - | | Fitchburg-Leominster, MA MSA abolished |
| - | | Ashby town (in Middlesex County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Ashburnham town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Fitchburg city (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Gardner city (in Worcester County, MA) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Leominster city (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Lunenburg town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Templeton town (in Worcester County, MA) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Westminster town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Winchendon town (in Worcester County, MA) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
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| Jun 1993 |
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| - | | PMSA reestablished: Fitchburg-Leominster, MA PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Ashby town (in Middlesex County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Ashburnham town (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Fitchburg city (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Gardner city (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Leominster city (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Lunenburg town (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Templeton town (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Westminster town (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Winchendon town (in Worcester County, MA) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Fitchburg, MA designated as original central city of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Leominster, 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 |
| - | | Fitchburg-Leominster, MA PMSA in Boston-Worcester-Lawrence, MA-NH CMSA abolished |
| - | | Fitchburg, MA no longer designated as principal/central city |
| - | | Leominster, MA no longer designated as principal/central city |
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