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| Component Change History |
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| Apr 1950 |
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| - | | Norwalk city (in Fairfield County, CT) included as original component of Stamford-Norwalk, CT SMA |
| - | | Westport town (in Fairfield County, CT) included as original component of Stamford-Norwalk, CT SMA |
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| Jun 1959 |
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| - | | New SMSA: Norwalk, CT SMSA |
| - | | Norwalk city (in Fairfield County, CT) deleted from Stamford-Norwalk, CT SMA, reverted to nonmetro status |
| - | | Westport town (in Fairfield County, CT) deleted from Stamford-Norwalk, CT SMA, reverted to nonmetro status |
| - | | Norwalk, CT designated as original central city of new SMSA |
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| Sep 1960 |
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| - | | Norwalk city (in Fairfield County, CT) added |
| - | | Westport town (in Fairfield County, CT) added |
| - | | Wilton town (in Fairfield County, CT) added |
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| Apr 1973 |
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| - | | Weston town (in Fairfield County, CT) added |
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| Oct 1975 |
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| - | | Norwalk, CT SMSA included in New York-Northeastern New Jersey, NY-NJ SCSA |
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| Jun 1983 |
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| - | | Norwalk, CT SMSA in New York-Northeastern New Jersey, NY-NJ SCSA became Norwalk, CT PMSA in New York-Northern New Jersey-Long Island, NY-NJ-CT CMSA |
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| Dec 1992 |
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| - | | Norwalk, CT PMSA in New York-Northern New Jersey-Long Island, NY-NJ-CT CMSA abolished |
| - | | Norwalk city (in Fairfield County, CT) transferred to Stamford-Norwalk, CT PMSA in New York-Northern New Jersey-Long Island, NY-NJ-CT-PA CMSA |
| - | | Weston town (in Fairfield County, CT) transferred to Stamford-Norwalk, CT PMSA in New York-Northern New Jersey-Long Island, NY-NJ-CT-PA CMSA |
| - | | Westport town (in Fairfield County, CT) transferred to Stamford-Norwalk, CT PMSA in New York-Northern New Jersey-Long Island, NY-NJ-CT-PA CMSA |
| - | | Wilton town (in Fairfield County, CT) transferred to Stamford-Norwalk, CT PMSA in New York-Northern New Jersey-Long Island, NY-NJ-CT-PA CMSA |
| - | | Norwalk, CT 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 |
| - | | Norwalk, CT designated as principal city of Bridgeport-Stamford-Norwalk, CT Metro Area in New York-Newark-Bridgeport, NY-NJ-CT-PA CSA |
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