Newcastle is an Eastside city in King County, Washington, United States. The population was 10,380 at the 2010 census and an estimated 12,292 in 2019.

Although Newcastle was not incorporated until 1994, it has been an important agreement and town back the late 19th century and played a major role in the take forward of Seattle and the surrounding region. Newcastle was one of the region’s first coal mining areas and its railroad join to Seattle was the first in King County. Timber afterward played a role in the forward history of Newcastle. Coal delivered by rail from Newcastle’s mines to Seattle fueled the lump of the Port of Seattle and attracted railroads, most notably the Great Northern Railway.

The Newcastle coal mine began producing coal by the 1870s. More than 13 million tons of coal had been extracted by the epoch the mine closed in 1963. The archives of Newcastle’s coal mining industry and the legacy of the mines’ many Chinese laborers are memorialized in place names such as Coal Creek, Coal Creek Parkway, and the Coal Creek and China Creek golf courses.

Based on per capita income, Newcastle ranks 11th of 522 areas in the come clean of Washington to be ranked. In CNN Money’s 2011 rankings of best places to sentient in the United States, Newcastle was in the top 20, along with clear Sammamish. It ranked 17th in Newsweek’s 2009 rankings of best places to alive in the United States

Newcastle was named after Newcastle upon Tyne in England, as it was originally a coal mining town founded in the 1870s. Coal was discovered along Coal Creek in 1863. The surveyors Philip H. Lewis and Edwin Richardson made the discovery even though surveying the Place for the General Land Office. By 1872 75-100 tons of coal per day were being produced at Newcastle. About 60 men worked at the mines. The Seattle and Walla Walla Railroad, the first railroad in King County, reached Newcastle from Seattle in 1878. Coal mining done in 1963.