The Maryborough Post Office opened in 1866 and is the oldest surviving masonry Post Office in Queensland. In those early days, attached to the top of the tower, was a wooden pole holding a Time Ball which was lowered each day at 1.00 p.m. The tower was extended in 1879 for better visibility and to house a clock with four faces. Adjacent to the Post Office is the site of the first Telephone Exchange in country Queensland, established here in 1882 with 32 subscribers.