The following is a list of numbered routes in Delaware, consisting of Interstate Highways, U.S.

State routes in Delaware use the circular highway shield.

There are some exceptions, however, mainly with routes from other states keeping their number as they enter Delaware, hence breaking the pattern.

The first numbered routes in Delaware came in 1925 with the designation of the U.S. Highway System, in which US 13, US 40, and US 113 were legislated to run through the state.

[2][3] By 1936, Delaware began assigning numbers to state routes.