Newcastle is an Eastside city in King County, Washington, United States. The population was 13,017 at the 2020 census. Although Newcastle …Newcastle is an Eastside city in King County, Washington, United States. The population was 13,017 at the 2020 census. Although Newcastle was not incorporated until 1994, it has been an important settlement and town since the late 19th century and played a major role in the development of Seattle and the surrounding region. Newcastle was one of the region's first coal mining areas and its railroad link to Seattle was the first in King County. Timber also played a role in the early history of Newcastle. Coal delivered by rail from Newcastle's mines to Seattle fueled the growth of the Port of Seattle and attracted railroads, most notably the Great Northern Railway.
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