Porirua is a city in the Wellington Region of New Zealand, immediately north of the city of Wellington, with their central business districts 20 km apart. A large proportion of the population commutes to Wellington, so it may be considered a satellite city. It almost completely surrounds Porirua Harbour at the southern end of the Kapiti Coast. The eastern (Pauatahanui) inlet of the harbour is notable for its world-class estuarine values. The population at the was .