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| Component Change History |
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| Apr 1950 |
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| - | | New SMA: Seattle, WA SMA |
| - | | King County, WA included as original component of Seattle, WA SMA |
| - | | Seattle, WA designated as original central city of new Seattle, WA SMA |
| - | | New SMA: Tacoma, WA SMA |
| - | | Pierce County, WA included as original component of Tacoma, WA SMA |
| - | | Tacoma, WA designated as original central city of new Tacoma, WA SMA |
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| May 1959 |
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| - | | Snohomish County, WA added to Seattle, WA SMA |
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| Oct 1963 |
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| - | | Title of Seattle, WA SMSA changed to Seattle-Everett, WA SMSA |
| - | | Everett, WA designated as central city of Seattle-Everett, WA SMSA |
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| Oct 1975 |
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| - | | New SCSA: Seattle-Tacoma, WA SCSA |
| - | | Seattle-Everett, WA SMSA included in Seattle-Tacoma, WA SCSA |
| - | | Tacoma, WA SMSA included in Seattle-Tacoma, WA SCSA |
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| Jun 1981 |
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| - | | New SMSA: Bremerton, WA SMSA |
| - | | Kitsap County, WA included as original component of Bremerton, WA SMSA |
| - | | Bremerton, WA designated as original central city of new Bremerton, WA SMSA |
| - | | New SMSA: Olympia, WA SMSA |
| - | | Thurston County, WA included as original component of Olympia, WA SMSA |
| - | | Olympia, WA designated as original central city of new Olympia, WA SMSA |
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| Jun 1983 |
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| - | | Seattle-Tacoma, WA SCSA became Seattle-Tacoma, WA CMSA |
| - | | Title of Seattle-Everett, WA SMSA in Seattle-Tacoma, WA SCSA changed to Seattle, WA PMSA in Seattle-Tacoma, WA CMSA |
| - | | Auburn, WA designated as central city of Seattle, WA PMSA in Seattle-Tacoma, WA CMSA |
| - | | Tacoma, WA SMSA in Seattle-Tacoma, WA SCSA became Tacoma, WA PMSA in Seattle-Tacoma, WA CMSA |
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| Dec 1992 |
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| - | | New CMSA: Seattle-Tacoma-Bremerton, WA CMSA |
| - | | Bremerton, WA MSA became Bremerton, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA |
| - | | Olympia, WA MSA became Olympia, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA |
| - | | Title of Seattle, WA PMSA in Seattle-Tacoma, WA CMSA changed to Seattle-Bellevue-Everett, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA |
| - | | Island County, WA added to Seattle-Bellevue-Everett, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA |
| - | | Bellevue, WA designated as central city of Seattle-Bellevue-Everett, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA |
| - | | Seattle-Tacoma, WA CMSA abolished |
| - | | Auburn, WA no longer designated as central city of Seattle, WA PMSA in Seattle-Tacoma, WA CMSA |
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| Jun 2003 |
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| - | | Seattle-Tacoma-Bremerton, WA CMSA became Seattle-Tacoma-Olympia, WA CSA |
| - | | Bremerton, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA became Bremerton-Silverdale, WA Metro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Olympia, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA became Olympia, WA Metro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Metro Area reestablished: Seattle-Tacoma-Bellevue, WA Metro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Seattle-Bellevue-Everett, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA became Seattle-Bellevue-Everett, WA Metro Division in Seattle-Tacoma-Bellevue, WA Metro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Kent, WA designated as principal city of Seattle-Bellevue-Everett, WA Metro Division in Seattle-Tacoma-Bellevue, WA Metro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Renton, WA designated as principal city of Seattle-Bellevue-Everett, WA Metro Division in Seattle-Tacoma-Bellevue, WA Metro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Tacoma, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA became Tacoma, WA Metro Division in Seattle-Tacoma-Bellevue, WA Metro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | New Micro Area: Oak Harbor, WA Micro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Island County, WA included as original component of Oak Harbor, WA Micro Area in Seattle-Tacoma-Olympia, WA CSA, transferred from Seattle-Bellevue-Everett, WA PMSA in Seattle-Tacoma-Bremerton, WA CMSA |
| - | | Oak Harbor, WA designated as original principal city of new Oak Harbor, WA Micro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | New Micro Area: Shelton, WA Micro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Mason County, WA included as original component of Shelton, WA Micro Area in Seattle-Tacoma-Olympia, WA CSA |
| - | | Shelton, WA designated as original principal city of new Shelton, WA Micro Area in Seattle-Tacoma-Olympia, WA CSA |
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