DE 100 was first designated in the 1930s to run from DE 52 to the Pennsylvania border, where it originally connected to Pennsylvania Route 100 (PA 100).
Billboard Hot 100 | Delaware | Wilmington, Delaware | Delaware River | ''Billboard'' Hot 100 | 100 metres | U.S. Route 66 | U.S. Route 1 | Delaware Bay | U.S. Route 6 | U.S. Route 101 | University of Delaware | Route 66 | U.S. Route 30 | New Jersey Route 4 | European route E65 | U.S. Route 40 | California State Route 1 | Newark, Delaware | U.S. Route 1 in Maine | Pennsylvania Route 309 | European route E18 | Delaware County | U.S. Route 23 | European route E4 | Canada's Top 100 Employers | U.S. Route 9 in New York | U.S. Route 11 | United States District Court for the District of Delaware | Pennsylvania Route 82 |