Mornington is a suburb of the city of Dunedin, in the South Island of New Zealand. It is situated on hilly slopes 2 kilometres (1.2 mi) to the west of the city centre, the slopes forming part of a ridge which surrounds the heart of the city. According to the 2013 New Zealand census, Mornington has a population of 3,267, a decrease of 126 people since the 2006 census. There were 1,518 males and 1,749 females. Landmarks within Mornington include the suburb's former post office in Mailer Street, a distinctive building completed in 1905 with small a mock-Byzantine domed tower above the entrance.