Are you wanting to pull the list ID via the API? Or pull it via Marketo to use in code somewhere?
If it's the latter, I think you can grab the ID by navigating to the list, then looking at the URL. You'll get something like: #ST12345A1 -- the ID would be the numbers after #ST and before A1. I'm not 100% sure about that, but that's how it works with forms.
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"Note: To access the list id through the Marketo UI, navigate to the list. The list id will be in the URL of the static list, https://app-****.marketo.com/#ST1001A1. In this example, 1001 is the ID for the list."