Post Office – Ipswich, 120 High Street – Opening Hours & Branch Details Post Office is easily accessible at 120 High Street, about a 10.77 mile distance west from the centre of Ipswich (near Clock Tower). The branch is located in a convenient district that essentially serves the people of Chelsworth, Hitcham Causeway, Bildeston, Wattisham and Hitcham. Doors are open today (Friday) at this spot from 7:00 am until 6:30 pm. Read the information on this page for Post Office Ipswich, 120 High Street, including the opening hours, street address, email address and more.