The powerful search criteria on the location management page allows you to view different groups of locations based on any combination of parent location address information and general geographic type information. You may also define search criteria such "locations linked to any parent location" or "locations not linked to any parent location". For example, you could display all locations in a given latitude / longitude that are not linked to any parent location.
Once your search results display the desired list of locations, you could do a mass update to assign or remove the parent location.
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