Michigan Public Land Auction
You can view Subdivision Plat Maps here.
If the parcel has an address listed, you can search for a location map here.
A directory of local assessors (for questions about the properties) can be found here. (Note: Not all township/city assessors are members of the MAA)
Michigan DNR topographical maps are available here.
Michigan's state land and mineral ownership map are available here.
The Michigan environmental contamination mapper can be found here.
You can lookup Michigan Business entities here.