Hi @JacobMunson,
Thanks for your patience so far!
To identify the location of the User, you can actually directly check the User details from here - https://developer.webex.com/docs/api/v1/people/get-person-details
Even if it's for a Calling User, still it's a Webex User only and the Webex Calling usually get configured to the same location from where the User belongs to.
May be you can toggle on the User's Calling data as "True" while Requesting this above API mentioned and once you find the locationId from the Response, you can take that locationId and find the details of that location from here - https://developer.webex.com/docs/api/v1/locations/get-location-details
Hope this helps!
Please let us know for any further assistance on the same.
Regards!
Sandip