You can easily track the past changes in the number of your contacts in the Contact History tab. It is located on the Contacts page of your dashboard:

The default view on this page shows the history of your All Contacts list. However, you can add up to 10 more lists to view their History:

  • Go to Contacts
  • Enter a list or segment (all except All Contacts which already is on the Contact History
  • Select Edit List (Or Edit Segment if segment was selected)
  • On the resulting popup, select "Track list history/Track segment history and click Save

Afterwards this list or segment will be visible in Contact History:

The Contact history list is updating once a day for the All Contacts list and for those lists and segments that have the tracking enabled.

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