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Mailchimp Audience 60 Groups API Limitation


In Mailchimp, if you've created a single Audience that has multiple Groups under Group categories the limit to all Groups under the Audience is 60 in Mailchimp's API.

Best Practice is using 1 Audience in Mailchimp with up to 60 Groups for segmentation. Leads, Contacts, and Accounts (Person Accounts too) can sync to the same Audience in Mailchimp.


Be sure to not exceed 60 Groups in Mailchimp on an Audience as the integration will error out.

Group options form

Error details: Mailchimp Error: Cannot have more than 60 interests per Audience (across all categories). [instance: 11e8f685-fda9-471f-bd91-317981dd045a] (HTTP Status Code: 400)

If you encounter this type of error, then please follow this best practice below:

  • The best practice to solve this issue is to review your Mailchimp Groups under each Group Category to make sure they are under 60.
  • Also, if you drive all your Groups from CRM then just delete the Group Category (all Groups) In Mailchimp, and then the next Reset Sync Process on the Set Up so SyncApps will recreate the Mailchimp Groups.
  • Please do this method to see the new Groups recreated and numbers sync up to under 60 Groups in Mailchimp.

If you require syncing another Mailchimp audience, you can create another Set Up.

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