DE 18 begins at the
Maryland border, where the road continues west into that state as
MD 318. From the state line, the route heads east on two-lane undivided Federalsburg Road, passing through agricultural areas with some woods and homes. The road runs through the community of
Atlanta, where it crosses Atlanta Road. After passing through the community of Clarksons Crossroads, DE 18 turns southeast onto Cannon Road while Federalsburg Road continues northeast toward the town of
Bridgeville. The road continues to the community of
Cannon, where it crosses the
Delmarva Central Railroad's Delmarva Subdivision line at-grade. East of Cannon, the route passes south of the town limits of Bridgeville, crossing
Clear Brook before it comes to an intersection with
US 13. Following this, DE 18 heads northeast through farm fields, reaching a junction with
DE 404. At this point, DE 18 heads east
concurrent with DE 404 along Seashore Highway through a mix of farmland and woodland with some residences and businesses. The road crosses the
Nanticoke River and passes through tracts of the
Redden State Forest, heading across Gravelly Branch to the south of Collins Pond and crossing
Deep Creek further east. DE 18/DE 404 enters the town of
Georgetown and becomes Bridgeville Road, running to the north of the Jack F. Owens Campus of
Delaware Technical Community College. The road intersects
US 113 and the western terminus of
DE 404 Truck in a commercial area and continues east. The two routes head southeast onto North Bedford Street, passing homes and businesses. The road intersects
US 9 at a
traffic circle called The Circle in the center of Georgetown, where the
Sussex County Courthouse is located. At this point, DE 18 ends and DE 404 continues east along US 9. DE 18 has an
annual average daily traffic count ranging from a high of 20,266 vehicles at the US 113 intersection to a low of 2,128 vehicles at the US 13 intersection. ==History==