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| Component Change History |
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| Apr 1950 |
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| - | | New SMA: St. Louis, MO-IL SMA |
| - | | Madison County, IL included as original component of St. Louis, MO-IL SMA |
| - | | St. Clair County, IL included as original component of St. Louis, MO-IL SMA |
| - | | St. Charles County, MO included as original component of St. Louis, MO-IL SMA |
| - | | St. Louis County, MO included as original component of St. Louis, MO-IL SMA |
| - | | St. Louis city, MO included as original component of St. Louis, MO-IL SMA |
| - | | St. Louis, MO designated as original central city of new St. Louis, MO-IL SMA |
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| Dec 1958 |
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| - | | Jefferson County, MO added to St. Louis, MO-IL SMA |
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| Oct 1963 |
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| - | | Franklin County, MO added to St. Louis, MO-IL SMSA |
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| Apr 1973 |
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| - | | Clinton County, IL added to St. Louis, MO-IL SMSA |
| - | | Monroe County, IL added to St. Louis, MO-IL SMSA |
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| Jun 1983 |
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| - | | Alton, IL designated as original central city of new Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Granite City, IL designated as original central city of new Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Belleville, IL designated as original central city of new East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | East St. Louis, IL designated as original central city of new East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | St. Charles, MO designated as original central city of new St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Jersey County, IL included as original component of Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | St. Louis, MO transferred from St. Louis, MO-IL SMSA to St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA and was designated as original central city of new PMSA |
| - | | Title of St. Louis, MO-IL SMSA changed to St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Clinton County, IL included as original component of East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | Madison County, IL included as original component of Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | Monroe County, IL included as original component of St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | St. Clair County, IL included as original component of East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | Franklin County, MO included as original component of St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | Jefferson County, MO included as original component of St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | St. Charles County, MO included as original component of St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | St. Louis County, MO included as original component of St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
| - | | St. Louis city, MO included as original component of St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA, transferred from St. Louis, MO-IL SMSA |
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| Oct 1984 |
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| - | | Title of St. Louis-East St. Louis-Alton, MO-IL CMSA changed to St. Louis, MO-IL MSA (The St. Louis-East St. Louis-Alton, MO-IL CMSA was abolished by P.L. 98-473, Section 119A, 98 Stat. 1968 (Oct. 12, 1984).) |
| - | | Clinton County, IL added to St. Louis, MO-IL MSA, transferred from East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Jersey County, IL added to St. Louis, MO-IL MSA, transferred from Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Madison County, IL added to St. Louis, MO-IL MSA, transferred from Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Monroe County, IL added to St. Louis, MO-IL MSA, transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | St. Clair County, IL added to St. Louis, MO-IL MSA, transferred from East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Franklin County, MO added to St. Louis, MO-IL MSA, transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Jefferson County, MO added to St. Louis, MO-IL MSA, transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | St. Charles County, MO added to St. Louis, MO-IL MSA, transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | St. Louis County, MO added to St. Louis, MO-IL MSA, transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | St. Louis city, MO added to St. Louis, MO-IL MSA, transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA |
| - | | Alton, IL transferred from Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA to St. Louis, MO-IL MSA and was designated as central city of MSA |
| - | | Belleville, IL transferred from East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA to St. Louis, MO-IL MSA and was designated as central city of MSA |
| - | | East St. Louis, IL transferred from East St. Louis-Belleville, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA to St. Louis, MO-IL MSA and was designated as central city of MSA |
| - | | Granite City, IL transferred from Alton-Granite City, IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA to St. Louis, MO-IL MSA and was designated as central city of MSA |
| - | | St. Charles, MO transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA to St. Louis, MO-IL MSA and was designated as central city of MSA |
| - | | St. Louis, MO transferred from St. Louis, MO-IL PMSA in St. Louis-East St. Louis-Alton, MO-IL CMSA to St. Louis, MO-IL MSA and was designated as central city of MSA |
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| Dec 1992 |
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| - | | Lincoln County, MO added to St. Louis, MO-IL MSA |
| - | | Warren County, MO added to St. Louis, MO-IL MSA |
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| Jun 2003 |
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| - | | New CSA: St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | Bond County, IL added to St. Louis, MO-IL Metro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | Calhoun County, IL added to St. Louis, MO-IL Metro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | Macoupin County, IL added to St. Louis, MO-IL Metro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | Crawford County, MO added to St. Louis, MO-IL Metro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | Washington County, MO added to St. Louis, MO-IL Metro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | Alton, IL no longer designated as principal/central city of St. Louis, MO-IL MSA |
| - | | Belleville, IL no longer designated as principal/central city of St. Louis, MO-IL MSA |
| - | | East St. Louis, IL no longer designated as principal/central city of St. Louis, MO-IL MSA |
| - | | Granite City, IL no longer designated as principal/central city of St. Louis, MO-IL MSA |
| - | | New Micro Area: Farmington, MO Micro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | St. Francois County, MO included as original component of Farmington, MO Micro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
| - | | Farmington, MO designated as original principal city of new Farmington, MO Micro Area in St. Louis-St. Charles-Farmington, MO-IL CSA |
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| Dec 2003 |
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| - | | Crawford County, MO deleted from St. Louis, MO-IL Metro Area in St. Louis-St. Charles-Farmington, MO-IL CSA, reverted to nonmetro status |
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