MountainOne Bank Drive-Thru ← View details 795 Main Street, Williamstown, MA 01267 +1 855-444-6861 mountainone.com Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 07:00 am — 05:00 pm Tuesday: 07:00 am — 05:00 pm Wednesday: 07:00 am — 05:00 pm Thursday: 07:00 am — 07:00 pm Friday: 07:00 am — 07:00 pm Saturday: 08:30 am — 12:00 pm Your comments * — Required information