I havent had any this year, but last year it looked like we mailed back the 8962 and 1095A to the same service center the return was filed at, so it depends on where you are....there was a fax number too, but Im sure that goes along with the filing center.

EDIT: Actually it got mailed back to the same address that CP2000 notices here in CA get mailed back to, so it wasnt the filing service center.