I agree with the above and would add my own experience.
I've had good results with the format www.widgetservices.com/location 1, www.widgetservices.com/location 2 etc.... all accessible from a drop down menu entitled "Locations and Clients". Each location page talks about the people who work at the location and has some mini-case studies and testimonials. The actual product descriptions, the same in each location, are elsewhere.
I also build links to the individual location pages. Each location page, in text and tags, is also optimized for the not only the main location but a few of the closest cities.
Note that this is a regional business with only 7 locations. YMMV.