DE 9 is the easternmost major north/south route in the northern half of Delaware. It begins at exit 91 of DE 1 in Dover and runs north to Port Penn. From there, it crosses the Chesapeake and Delaware Canal via the Reedy Point Bridge to Delaware City. It continues north through New Castle to Wilmington, where it joins US 13. The two routes are multiplexed along South Heald Street and Fourth Street across the Christina River. On the other side, US 13 splits off. DE 9 continues northwest through Wilmington along Fourth Street until Union Street (DE 2), where DE 9 ends.
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