You will need to add location in as a custom field to your ticket. Then you have the choice either make the field a single select dropdown, and then populate the field with the locations you wish to see, or alternatively set the field to lookup from the user table.
If you import locations in from AD with your users, then you can display those location values on a drop down
Try something like this...
query: select distinct(LOCATION) from USER
If you click the blue question mark next to the Custom fields heading all will be revealed
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