THE ST. CLAIR COUNTY LAND BRIEF
Land in the
Maumee Lake Plain setting.
St. Clair County has 721.5 square miles of land in Michigan. 2 mapped landscape regions meet across St. Clair County: Maumee Lake Plain, Saginaw Lake Plain.
A broad former lake plain is interrupted by old beach ridges, dunes and glacial moraines. The landscape is mostly low-relief, with important differences between sandy rises and lower ground.
Regional context: Huron/Erie Lake Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
St. Clair County intersects 2 mapped regional units. The largest mapped shares are:
- Maumee Lake Plain65.7%
- Saginaw Lake Plain34.3%
Finding your parcel within St. Clair County
The atlas lists 36 cities, towns, townships, and Census communities associated with St. Clair County, including St. Clair, Riley, Wales. The list includes overlapping geography types and does not divide the county into exclusive service areas.
St. Clair County by land and water
The Census records 115 square miles of water within St. Clair County, or 13.7% of its total area. That share is close to St. Clair County’s 13.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, St. Clair County has 19.3 times the land area of nearby Wales township (37.4 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Lapeer County, Macomb County, Sanilac County within Michigan. A tract near one of these lines should be matched to the county identifier on its own records.

