Delaware was the only state not adopting regulation of intrastate bus service. The February 1922 issue of the publication "Bus Transportation", lists the operators and routes at the time.
Because Delaware is a small densely populated state, bus service generally is of a more local nature. Wilmington is the largest city in Delaware, with streetcars operating until 1940. In 1941, operating buses only, that system became known as Delaware Coach Co. A predecessor to the present state owned system DART.
Operator Route Delaware Rapid Transit Wilmington-Townsend Peoples Bus Line Marshallton-Wilmington Liberty Bus Line Wilmington-Marshallton Royal Bus Line Wilmington-Marshallton J. J. Kellerher Wilmington-Marshallton Red Arrow Bus Line Wilmington-Marcus Hook PA New Castle & Wilmington Bus Co. Wilmington-New Castle Wm. B. Loller Middletown-Earleville MD Alfred C. Stiltz Wilmington-Newark-Elkton MD West Chester Transportation Co. Wilmington-West Chester PA B & D Bus Line Wilmington-Kennett Sq. PA O'Neil's Bus Line Wilmington-Yorklyn