mapNewcastle is a family-oriented city in King County, Washington with a population of 9,925 in 2009. Newcastle was incorporated in 1994. The city is 4.5 square miles in size with waterfront access to Lake Washington. Newcastle is a suburban community with residents working in nearby Seattle, Bellevue, and Renton.

Newcastle played an important role in Seattle's history because of the it provided natural resources of coal and timber which enabled the growth of Seattle. Newcastle's last coal mine closed in the 1960s.

Major highways providing access to Newcastle are Interstate 405 and Interstate 90. It is approximately 8 miles south of Bellevue's downtown via Interstate 405 and Coal Creek Parkway. Newcastle is approximately 13 miles southeast of downtown Seattle and is access via Interstate 90 and the Factoria/Richards Road exit.

Bordering Cities

Newcastle is bordered by Bellevue to the north-east, Factoria to the north, Mercer Island to the west, Kennydale to the south-west, Renton to the south, Issaquah to the east and Lake Washington to the west.


Newcastle is on the border of two school districts. Some students attend Liberty Senior High School which is part of the Issaquah School District and some attend Hazen High School which is part of the Renton School District.

Notable Residents
  • James Hasty - Former NFL player
  • Mack Strong - Former Seattle Seahawks NFL player
  • Alan White - Yes drummer
Attractions Parks & Trails

Newcastle has 40 acres of developed parks including Lake Boren Park. The city also provides a network of trails which encompasses seven miles of trail between city points and to the Cougar Mountain Regional Wildland Park. Locations of parks:

  • Lake Boren Park - Coal Creek Parkway and SE 84th
  • May Creek Park - southern edge of the city
  • China Creek Park - China Creek Subdivision
  • Hazelwood Park - end of 121st Place SE
  • Redman Park - adjacent to Thomas Rouse Road
  • Donegal Park - SE 74th and 123rd Ave. SE