To see how many clients and patients are in your system, go to Clients & Patients. At the top of the page you will find a count of all your active, registered clients and their associated patients (both active and archived) in all your clinic locations.
You can use Extended search to filter the list. The search results are shown below the search options. From there, you can export the results to a file.
One helpful way to organize your view is to sort clients and patients by their home clinic location. Note that if a client has more than one patient, they are listed separately for each patient in the search results.