The most commonly known system is that of Detroit, including 8 Mile Road, the dividing line between Detroit and its northern suburbs as well as Wayne County and Oakland, Macomb and Washtenaw counties.
The roads in the Detroit-area system are laid out in a grid and named with reference to a zero-mile "point of origin" in Campus Martius Park in downtown Detroit.
In Grand Traverse County, the mile roads are numbered from the location of the Boardman River and the ghost town of Keystone, named after its location at an important point on the river.
Fulton Street is the north–south dividing line of the city of Grand Rapids.
In Manistee County, roads are numbered north from the village of Eastlake