Greymouth is the largest town in the West Coast region in the South Island of New Zealand, and the seat of the Grey District Council. The population of the whole Grey District is 14,250, which accounts for 43% of the West Coast's inhabitants. The Greymouth urban area had an estimated population of 8,340. A large proportion of the District, 65%, is part of the Conservation Estate owned and managed by the Department of Conservation making Greymouth a natural centre for walkers and trampers.

The West Coast is a region of New Zealand on the west coast of the South Island. It is administered by the West Coast Regional Council, and is known co-officially as Te Tai Poutini. It comprises the territorial authorities of Buller District, Grey District and Westland District. The principal towns are Westport, Greymouth and Hokitika. The region, one of the more remote areas of the country, is also the most sparsely populated. With a population of just 32,900 people, the West Coast is the least populous region in New Zealand. The population in the region grew by 0.4% over the year to July 2023.