[1] In 2007, the United States Department of Transportation awarded a $174,600 grant to preserve the Route 9 and Brandywine Valley byways.

[5] The byway passes by several tourist destinations, including Rodney Square, Hotel du Pont, the Goodstay House, the Gibraltar Mansion, the Delaware Museum of Natural History, Winterthur Museum and Country Estate, and Centreville Village on DE 52 and Montchanin Village, Brandywine Creek State Park, and First State National Historical Park on DE 100.

The byway provides access to several natural and historical sites and towns along the Delaware Bay and inland rivers, including Milton, the Prime Hook National Wildlife Refuge, Slaughter Beach, Milford, South Bowers, Bowers Beach, the John Dickinson Plantation and First State Heritage Park in Dover, the Bombay Hook National Wildlife Refuge, Port Penn Interpretive Center, Fort Delaware State Park, and the New Castle Historic District.

In 2007, the Route 9 Coastal Heritage Byway was nominated and designated as a Delaware Scenic and Historic Highway.

[9] A ceremony unveiling the National Scenic Byway designation was held on April 22, 2021, with Governor John Carney, DelDOT secretary Nicole Majeski, and other officials in attendance.

The byway provides access to sites related to the Underground Railroad, including the Camden Friends Meetinghouse in Camden; Wildcat Manor near Dover; Blackbird State Forest; the Odessa Historic District which includes the Appoquinimink Friends Meetinghouse and Corbit-Sharp House; the New Castle Court House Museum in New Castle; the Tubman-Garrett Riverfront Park, the Thomas Garrett House, Old Town Hall, Friends Meetinghouse, and Quaker Hill Historic District in Wilmington; and Centreville Village.

The byway provides access to many sites including the Garrett Snuff Mill in Yorklyn, the Wilmington and Western Railroad between Greenbank and Hockessin, the Ashland Nature Center, the Mt.