Which city, located about 12 miles north of Detroit city limits, was the location of the Olympian Motors Company? 
Olympian (automobile): The Olympian was an automobile built in Pontiac, Michigan, USA, by the Olympian Motors Company from 1917 to 1921. Pontiac, Michigan:  It is the county seat of Oakland County, and about 12 mi north and slightly west of the Detroit city limits.
Pontiac, Michigan