Post Office – Penzance, Mousehole – Opening Hours & Branch Details Post Office occupies an ideal spot at 18 North Cliff, about 2.43 miles south from the centre of Penzance (close to Coastgard). The branch serves the customers of Paul, Trevithal, Lamorna, Mousehole, Raginnis, Castallack, Tredavoe and Sheffield. It’s open today (Friday) from 8:00 am until 5:30 pm. Here, on this page, you’ll find other information about Post Office Penzance, Mousehole, including the operating hours, place of business address or contact details.