New Castle is a city in New Castle County, Delaware, six miles (10 km) south of Wilmington, situated on the Delaware River. In 1900, 3,380 people lived here; in 1910, 3,351. According to the 2010 Census, the population of the city is 5,285
|City of New Castle|
Old New Castle Courthouse.
New Castle is located at (39.664712, −75.565392)GR1.
According to the United States Census Bureau, the city has a total area of 3.2 square miles (8.2 km²), of which, 3.0 square miles (7.9 km²) of it is land and 0.1 square miles (0.3 km²) of it (3.79%) is water.
This city is the home of Broad Dyke, the first dyke built in the United States.