St. Clair County, Michigan Genealogy Records

Selected record inventories for St. Clair County, their listed years, and where to ask for access.

Selected inventory review: 2026-11-02. Selected catalog metadata extracted from the linked sources. This is not an examination of original records, a complete county holdings audit, or certification of current access. Historical sources are identified in the access note. Archives of Michigan county guide

Formed
1821
County seat
Port Huron
Genesee CountyLapeer CountyOakland CountySanilac CountyTuscola CountyWayne CountyMacomb CountySt. Clair CountyLapeerOaklandMacombSt. Clair
St. Clair CountyParent county (search here for earlier records)Today's boundaries · U.S. Census Bureau

Listed record inventories

Selected holdings and indexes for St. Clair County, checked against the repository descriptions linked below. Date spans may contain gaps; an index is not a complete set of original records.

Court Records

See the repository's descriptions and search options

Repository access note: Selected holdings described by the Archives of Michigan. Preserve the record-group (RG) reference when requesting records. Some collections are held at partner repositories; consult the guide before traveling. Asterisks and other qualifiers refer to access or location notes in that guide. Some records have privacy restrictions or require proof of death. A date span may contain gaps and does not establish that images are online.

Sources: the catalogs and repository descriptions linked on the entries above. Selected inventories do not establish complete coverage of every record type or online access to original documents. Read the repository access note for source dates and limitations.

Where to find the records

Offices change their hours and access rules; call before you visit.

Boundaries and parent counties

Formed from: Macomb County

Check the parent county for earlier records: Macomb County

Later formed partly from St. Clair County: Saginaw County, Sanilac County

MonroeWayneOaklandNon-County Area 2Non-County Area 1MichilimackinacMacombST. ClairST. ClairWayneNon-County Area 1
ST. Clair as created in 1821Where its land was the day beforeToday's boundaryBoundaries: Newberry Library, Atlas of Historical County Boundaries

Records stay with the county that created them. If your ancestor lived here before 1821, search the parent county. The Atlas of Historical County Boundaries shows each boundary change.

Research tip

Michigan began registering births and deaths in 1867, much earlier than most states, with county clerks keeping the registers and sending copies to the state. Ask the county clerk for the early registers.