In the 2011 census, Port Moresby had 364,145 inhabitants. An unofficial 2020 estimate gives the population as 383,000. The place where the city was founded has been inhabited by the Motu-Koitabu people for centuries. The first Briton to see it was Royal Navy Captain John Moresby in 1873. It was named in honour of his father, Admiral of the Fleet Sir Fairfax Moresby.