About 5,500 people.

New Castle is one of the oldest towns in Delaware, with cobblestone streets and colonial buildings that look almost the same as they did hundreds of years ago. It sits along the Delaware River.
You can walk the historic Green, tour the old courthouse where laws were made long ago, and stroll along the riverfront Battery Park. It feels like stepping back in time.
New Castle's cobblestone streets and brick houses date back to when Delaware was a colony. The old courthouse is one of the oldest in the whole country.
This riverside park lets you watch big ships glide down the Delaware River. It has grassy fields, a walking trail, and lovely sunset views.