If I run the following query in a Marketing Cloud (Corporate version account so there are no BUs):
SELECT EmailAddress, SubscriberKey, Status FROM _Subscribers WHERE Status = 'Unsubscribed'
I get a count of 545,350
However, if I navigate to the All Subscribers list and search for status of "Unsubscribed", I get 560,035.
While this is live data and I might expect a difference of a few, why is there a ~15k difference? They should be the same. What is being pulled in by the search in the All Subscribers list that isn't being pulled in by the _Subscribers view and what should the query be to return the same count as pulling the count manually in the All Subscribers list?