Maine, still good old 207!
From Wikipedia "Area code 207 is the state of Maine's sole area code, except for a tiny portion which uses the Quebec area code 418. Area code 207 was created as one of the original area codes in 1947. The hamlet of Estcourt Station uses Quebec area code 418 rather than Maine area code 207."
Folks in my town don't even bother with the first three digits of the phone number, they just give the last four. Its assumed that everyone knows prefix of "882", so I've often been told "just call me at 9876" like that is the complete number. It took me a few times to ask until I understood what they were getting at.
I find it charming.