New Castle Real EstateNew Castle is located in Delaware. New Castle, Delaware has a population of 5,364. New Castle is less family-centric than the surrounding county with 17.06% of the households containing married families with children. The county average for households married with children is 29.09%. The median household income in New Castle, Delaware is $59,773. The median household income for the surrounding county is $68,336 compared to the national median of $57,652. The median age of people living in New Castle is 46.7 years. New Castle WeatherThe average high temperature in July is 85.8 degrees, with an average low temperature in January of 24.6 degrees. The average rainfall is approximately 45.6 inches per year, with 12.8 inches of snow per year. New Castle MapReal estate near New CastleNearby CitiesNearby Cities Homes for Sale |