The St. Joseph County Grange Fairgrounds is located in Centreville, Michigan, the center of St. Joseph County, off the M-86 highway.

Address:
316 E. Charlotte
Centreville, MI 49032

We have found that some GPS systems do not pick up that address.  For your convenience, here are the coordinates of the address:
Latitude: 41.9213487
Longitude: -85.5232737