Listings have a single main location which is selected and added when adding/editing a listing.
However, additional locations may be added to a listing.
These locations will appear on the listing detail page.
Additional locations are not searched, they are for display purposes only.
Adding Additional Locations
Under the Control Panel → Setup → Products / Services edit your products and make sure the "Location Limit" setting is set higher than 0.
When editing a listing a "Locations" button with a + sign next to it will appear in the header area.
These buttons allow you to view the additional locations for a listing as well as add additional locations.