| 1970 | 1980 | 1990 | 1993+ | ||||
|---|---|---|---|---|---|---|---|
| Detroit SMSA | Wayne Oakland Macomb | Detroit SMSA | Wayne Oakland Macomb Livingston St.Clair Lapeer | Detroit PMSA | Wayne Oakland Macomb Livingston St.Clair Lapeer Monroe | Detroit PMSA | Wayne Oakland Macomb St.Clair Lapeer Monroe |
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| Ann Arbor SMSA | Washtenaw | Ann Arbor PMSA | Washtenaw | Ann Arbor PMSA | Washtenaw Livingston Lenawee |
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| Flint PMSA | Genesee |
