I came across this thread from an old search - sorry that it didn’t get answered. But for @Jorge_Upenn or anyone else finding this, the visit_panel_summary column indeed shows num_unique_visitors , so it can be used for answering this question.
Thank you for replying. visit_panel_summary is aggregated to the state level, should I expect the proportions to scale down? That is, if for PA 60% of the devices have a home attributed to them, then roughly 60% in each county have homes. Or is there somewhere that has this with more granularity?