Williamstown Post Office

613-347-2641

Monday - 9:15 AM –12:30 PM & 1:30 PM–5:00 PM

Tuesday - 9:15 AM –12:30 PM & 1:30 PM–5:00 PM

Wednesday - 9:15 AM –12:30 PM & 1:30 PM–5:00 PM

Thursday 9:15 AM –12:30 PM & 1:30 PM–6:00 PM

Friday 9:15 AM –12:30 PM & 1:30 PM–5:00 PM

19688 Warren Street

The Williamstown Post Office would like to remind you to include your PO Box number on all your incoming correspondence to ensure your mail arrives.