is a city in King County, Washington, United States. The population was 7,737 at the 2000 census.
Although Newcastle was not incorporated until 1994, it played a vital role in opening up the Seattle region for expansion. In many ways, it was the poster child for development in the Pacific Northwest in the late 1800s—rail, coal, and timber were the key themes of this time, and Newcastle was at the nexus of all of them. Newcastle's coal mine and railroad helped transform Seattle into a major port.
In 1872, between 75-100 tons of coal was produced each day in Newcastle; by the time the mine closed for the last time in 1963, more than 13 million tons had been extracted. Its legacy remains ever-present in local place names such as Coal Creek Parkway, and China Creek Golf Course. An active, well-informed, and passionate group of citizens remain committed to sharing Newcastle's history with visitors and residents. The city celebrates Newcastle Days at a community festival each September.
Based on per capita income Newcastle ranks 23rd of 522 areas in the state of Washington to be ranked.
Newcastle was most likely named after Newcastle upon Tyne in England, as it was originally a coal mining town founded in the 1870s. Coal mining ended in 1963. The area was an unincorporated area within King County until it incorporated as a city on September 30, 1994. Currently the city is a suburban community; most residents work in nearby Seattle, Bellevue, or Renton. The most notable attractions of the area are probably The Golf Club at Newcastle, Lake Boren Park, and Newcastle's many parks and trails.
Now, the 14 year-old city is fighting for it's own zip code, as postage taxes are going to Renton instead of to the belonging Newcastle.