About Newcastle, WA Real EstateInformation About NewcastleNewcastle is located in Washington. Newcastle, Washington has a population of 12,308. Newcastle is more family-centric than the surrounding county with 33% households with children. The county percentage for households with children is 26%. The median household income in Newcastle, Washington is $116,641. The median household income for the surrounding county is $82,656 compared to the national median of $57,525. The median age of people living in Newcastle is 41.9 years. Newcastle WeatherThe average high temperature in July is 76.87 degrees, with an average low temperature in January of 34.73 degrees. The annual precipitation is 38.79. Newcastle MapNewcastle real estate officesReal estate near NewcastleNearby CitiesNearby Cities Homes for Sale |