A MailChimp signup form connects to one list only. To manage subscribers with multiple interests or categories, use groups or segments in your list. These eliminate redundant data from your lists, and provide helpful targeting tools when you send campaigns. When you use a single list, we’ll block imports of duplicate addresses, which lowers monthly billing costs.
It’s possible to edit the code of an embedded signup form to submit to multiple lists, but it’s an advanced task recommended for users with programming experience or access to a developer who is familiar with our API. If you need help, try our MailChimp experts.