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| Component Change History |
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| Apr 1950 |
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| - | | New SMA: Worcester, MA SMA |
| - | | Auburn town (in Worcester County, MA) included as original SMA component |
| - | | East Brookfield town (in Worcester County, MA) included as original SMA component |
| - | | Grafton town (in Worcester County, MA) included as original SMA component |
| - | | Holden town (in Worcester County, MA) included as original SMA component |
| - | | Leicester town (in Worcester County, MA) included as original SMA component |
| - | | Millbury town (in Worcester County, MA) included as original SMA component |
| - | | Northborough town (in Worcester County, MA) included as original SMA component |
| - | | North Brookfield town (in Worcester County, MA) included as original SMA component |
| - | | Shrewsbury town (in Worcester County, MA) included as original SMA component |
| - | | Spencer town (in Worcester County, MA) included as original SMA component |
| - | | Westborough town (in Worcester County, MA) included as original SMA component |
| - | | West Boylston town (in Worcester County, MA) included as original SMA component |
| - | | Worcester city (in Worcester County, MA) included as original SMA component |
| - | | Worcester, MA designated as original central city of new SMA |
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| Jun 1959 |
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| - | | Berlin town (in Worcester County, MA) added |
| - | | Boylston town (in Worcester County, MA) added |
| - | | Brookfield town (in Worcester County, MA) added |
| - | | Northbridge town (in Worcester County, MA) added |
| - | | Oxford town (in Worcester County, MA) added |
| - | | Sutton town (in Worcester County, MA) added |
| - | | Upton town (in Worcester County, MA) added |
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| Oct 1963 |
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| - | | Paxton town (in Worcester County, MA) added |
| - | | Sterling town (in Worcester County, MA) added |
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| Apr 1973 |
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| - | | Charlton town (in Worcester County, MA) added |
| - | | Uxbridge town (in Worcester County, MA) added |
| - | | Webster town (in Worcester County, MA) added |
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| Jun 1983 |
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| - | | Barre town (in Worcester County, MA) added |
| - | | Berlin town (in Worcester County, MA) transferred to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
| - | | Clinton town (in Worcester County, MA) added |
| - | | Douglas town (in Worcester County, MA) added |
| - | | Dudley town (in Worcester County, MA) added |
| - | | Princeton town (in Worcester County, MA) added |
| - | | Rutland town (in Worcester County, MA) added |
| - | | Upton town (in Worcester County, MA) transferred to Boston, MA PMSA in Boston-Lawrence-Salem, MA-NH CMSA |
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| Dec 1992 |
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| - | | Worcester, MA transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA, designated as central city of PMSA |
| - | | Worcester, MA MSA abolished |
| - | | Thompson town (in Windham County, CT) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Auburn town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Barre town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Boylston town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Brookfield town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Charlton town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Clinton town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Douglas town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Dudley town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | East Brookfield town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Grafton town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Holden town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Leicester town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Millbury town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Northborough town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Northbridge town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | North Brookfield town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Oakham town (in Worcester County, MA) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Oxford town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Paxton town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Princeton town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Rutland town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Shrewsbury town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Southbridge town (in Worcester County, MA) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Spencer town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Sterling town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Sturbridge town (in Worcester County, MA) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Sutton town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Uxbridge town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Webster town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Westborough town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | West Boylston town (in Worcester County, MA) transferred to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | West Brookfield town (in Worcester County, MA) added to Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Worcester city (in Worcester 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: Worcester, MA-CT PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Thompson town (in Windham County, CT) included as original component of reestablished PMSA, transferred from Boston, MA-NH PMSA in Boston-Worcester-Lawrence, MA-NH CMSA |
| - | | Holland town (in Hampden County, MA) included as original component of reestablished PMSA |
| - | | Auburn 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 |
| - | | Barre 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 |
| - | | Boylston 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 |
| - | | Brookfield 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 |
| - | | Charlton 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 |
| - | | Clinton 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 |
| - | | Douglas 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 |
| - | | Dudley 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 |
| - | | East Brookfield 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 |
| - | | Grafton 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 |
| - | | Holden 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 |
| - | | Leicester 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 |
| - | | Millbury 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 |
| - | | Northborough 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 |
| - | | Northbridge 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 |
| - | | North Brookfield 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 |
| - | | Oakham 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 |
| - | | Oxford 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 |
| - | | Paxton 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 |
| - | | Princeton 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 |
| - | | Rutland 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 |
| - | | Shrewsbury 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 |
| - | | Southbridge 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 |
| - | | Spencer 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 |
| - | | Sterling 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 |
| - | | Sturbridge 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 |
| - | | Sutton 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 |
| - | | Uxbridge 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 |
| - | | Webster 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 |
| - | | Westborough 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 |
| - | | West Boylston 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 |
| - | | West Brookfield 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 |
| - | | Worcester 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 |
| - | | Worcester, 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 |
| - | | Worcester, MA-CT PMSA in Boston-Worcester-Lawrence, MA-NH CMSA became Worcester, MA Metro Area in Boston-Worcester-Manchester, MA-NH CSA |
| - | | Worcester County, MA included as original county component of Metro Area |
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