New Castle County is the northernmost of the three counties of the U.S. state of Delaware. As of the 2010 census, the population was 538,479, making it the most populous county in Delaware, with just under 60% of the state's population of 897,936 in the same census. The county seat is Wilmington.New Castle County is included in the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Area. The county is named after the English city of Newcastle.New Castle County has the highest population and population density of any Delaware county, and it is the smallest county in the state by area. It has more people than the other two counties, Kent and Sussex, combined. It is also the most economically developed of the three.Matt Meyer was elected New Castle County Executive in 2016.New Castle County is home to two minor league sports teams: the Wilmington Blue Rocks (baseball) and the Delaware 87ers (basketball) which play in Newark. It also has a professional auto racing track in New Castle known as Airport Speedway, which races on Saturday nights throughout the summer.
