New Castle County is a county located in the U.S. state of Delaware. As of the most recent data available, the county has a population of approximately 500,265 people, with a population density of about 174.33 persons per square mile.
The county spans a total land area of 426.00 square miles (1,103.00 square kilometers). The administrative center and county seat is Wilmington, which often serves as a hub for local governance and services. The largest city within the county by population is Brandywine.
Geographically, New Castle County experiences varied elevations, with its highest point at Brandywine 400 ft and its lowest point at Greenville 0 ft. The region operates in the UTC-5.