Delaware Route 100

Delaware Route 100
Route information
Maintained by DelDOT
Length	8.99 mi[1] (14.47 km)
Existed	1938[2]–present
Tourist routes	Brandywine Valley National Scenic Byway
Major junctions
South end	DE 4 near Elsmere
Major intersections	DE 2 in Elsmere DE 48 near Wilmington DE 141 near Wilmington DE 52 in Greenville DE 92 in Montchanin
North end	SR 3100 at Pennsylvania border near Montchanin
Location
Country	United States
State	Delaware
Counties	New Castle
Highway system
Delaware State Route System List Byways
← I-95 → US 113

Delaware Route 100 (DE 100) is a state highway in New Castle County, Delaware. The route runs from DE 4 near Elsmere to the Pennsylvania border near Montchanin, where it continues into Pennsylvania as State Route 3100 (SR 3100, Chadds Ford Road). The road runs through suburban areas of northern New Castle County. The route intersects DE 2 in Elsmere before forming separate concurrencies with DE 48 and DE 141 from west of Wilmington north to Greenville. In Greenville, there is an interchange with DE 52. North of Greenville, DE 100 continues by itself to the Pennsylvania border, intersecting DE 92 in Montchanin. DE 100 was first designated in the 1930s to run from DE 52 to the Pennsylvania border, where it connected to Pennsylvania Route 100 (PA 100) until the southern terminus of that route was truncated away from the state line in 2003. By the 1970s, it was extended south to DE 4. The route was realigned to follow parts of DE 48 and DE 141 by 1990.