Find Your List ID
To find the list ID for an existing Klaviyo list, navigate to the Lists & Segments tab of your account and click on a particular list.
Then, navigate to the Settings tab in your account. Here, you can find a list's ID. Every list has a unique ID, as does every user, flow, campaign, etc.
Additionally, you can find a list's ID in the URL in your browser when viewing this list. In the URL, you will find a short series of numbers and letters -- this is the list ID.
Switching Sign Up Forms from One List to Another
You will need to know a list's ID when you're connecting a sign up form. If you use Klaviyo's sign up form builder, the code that automatically populates includes the correct list ID.
If you delete a list or want to adjust a sign up form so that it adds subscribers to a different list, you will have to locate the list ID in the form code and swap it out.