I had to open an old copy of FMP 5.5 to check but this works out just about the same in FMP 10 as it does in this much older version:
Your location must be a stored field that can be indexed.
Define a value list and use the Specify Field option to specify your location field as the source of Location values. Let's name this value list "Location List".
Define a calculation field set to return text:
ValueListItems ( Status ( CurrentFileName ), "Location List" )
In FMP 10, this would read: ValueListItems ( Get ( FileName ), "Location List" )
Put this field on a layout and either resize it tall enough so that you can see all the values or give it a scroll bar.
Note: ValueListItems returns an empty string if the value list does not exist with the same exact name.