This feature requires Manager user level or higher.
Each MailChimp list has a unique List ID that integrations, plugins, and widgets may require to connect and transfer subscriber data. The List ID is generated by our system when the list is created and cannot be changed.In MailChimp there are two ways to find the List for MailChimp List.
4.Scroll to find the unique List ID field. The string of letters and numbers is the list ID.