At this point, DE 9 becomes West 7th Street and passes and industrial development. The route turns north-northwest onto Washington Street and crosses Norfolk Southern's New Castle Secondary railroad line at-grade, heading into residential areas. DE 9 comes to an intersection with the southern terminus of DE 141 and the eastern terminus of DE 273, at which point DE 9 Truck returns to the route by way of DE 273. Here, DE 9 turns east onto Delaware Street. The road carries one eastbound lane and two westbound lanes, with a multi-use trail parallel to the north. The route narrows back to two lanes and crosses the Jack A. Markell Trail, where the parallel multi-use trail ends, before it heads across the Norfolk Southern line again at-grade, at which point it turns east-northeast onto Ferry Cut Off Street near the New Castle Historic District. The historic district is home to the New Castle Court House Museum, New Castle Green, and the Sherriff's House, which are all part of First State National Historical Park. The road passes homes and businesses before intersecting East 6th Street.