The region stretches from the riverfront out through Wayne, Oakland and Macomb counties, and people rarely think of themselves as shopping in Detroit when they search. They add Troy, Dearborn, Royal Oak or Warren to the query, or they let Google read their phone location and show whatever sits closest. A company that serves the whole area but has one thin location page usually appears for a narrow slice of its real territory.
Suburbs, corridors and the pull of the freeways
Commuting habits shape where customers are willing to go. Someone living off the Lodge or near the Southfield Freeway will consider a provider along that route, while a family on the east side often looks toward St. Clair Shores or the Pointes first. Your service area pages, your Google Business Profile categories and the towns named in your copy should follow those patterns rather than a radius drawn on a map.
Words that differ from one county to the next
Search language shifts too. Dearborn has a large Arabic speaking community, and some categories there get real queries in Arabic. Downriver towns are searched as a group name, and many residents type that word instead of a specific city. Good keyword research for this metro catches those habits before any page gets written.