Route 39 originally continued westward, crossing the Yardley–Wilburtha Bridge in the community of Wilburtha, New Jersey near State Highway Route 29.
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State Highway Route 39 continued northward, intersecting with U.S. Route 130 and State Highway Route 25 in Bordentown.
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It was fully concurrent with U.S. Route 206 from its southern terminus at U.S. Route 30/State Highway Route 43/State Highway Route 54 in Hammonton to the current-day intersection with County Route 524 in Hamilton Township.
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From there, State Highway Route 39 made a bypass of the state capital, running northward through Mercer County until entering the community of Wilburtha, New Jersey.
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Routes 39 and 206 continued northward along the Mission Road before turning off and onto the straight alignment into Hamilton Township, a community outside of Trenton, the state capital.
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