Newcastle was formerly renowned for coal production, and has an unusually rich history for a city its size. 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.

Ranked as one of the best small towns in America, Newcastle combines the convenience and choices of urban living with the comfort and community of a small town. Newcastle residents can live, work, shop, and play, commute easily to the best jobs in the Pacific Northwest, and return home to natural areas, trails and other opportunities for recreation.