Speculating where Shin lives was a hobby of mine during his time here.
He got his shot in a border state that was 20 miles from where he lives: When will you allow yourself to be vaccinated? - #426 by shinobi
A little further down in that thread, he mentions that the state he was traveling to for that vaccine “required” residency based on this list: Vaccine vacation: Shot-seekers head to other states in hope of appointment. He eventually got a shot at a Rite Aid.
He mentions here that his state voted from Trump in 2016 - this eliminates the NE states: Filing your 2018 tax return? How's it going? - #181 by shinobi
Various comments have made clear that he lives somewhere out in the boonies, miles from civilization.
Based on all of this, I believe he lives in rural Northern Pennsylvania, somewhere near the New York border.