- National Association of Counties: St. Clair County, MI
- Offers demographic data, census facts, and list of elected officials and cities in the county.
- National Register of Historical Places: St. Clair County, Michigan
- Provides general information about the historical places and districts in the county. Data about the owner, function, significance, builder, and address.
- St. Clair County
- Official government site includes information about services, departments, administration, meetings, events, and the community.
- St. Clair County Genealogy Trails
- Provides genealogical and historical data including biographies, obituaries, vital records, surnames, business and manufacturing and historical resources.
- St. Clair County Plat
- A detailed, interactive plat map of the county and its cities and towns in PDF format.
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