Doing some spring cleaning? If you’d like to get rid of a list without deleting the contacts themselves, just follow these steps. If you want to delete the contacts in a specific audience list, there’s a page for that too[link]
Step 1 – Select your list and click the trash can icon:
Step 2 – Confirm:
Click OK to confirm.
Remember, deleting a list does not delete the contacts contained in the list. Those folks will remain in any other lists they’re members of and in your All contacts list.