Route 39 was a major state highway in the southwestern portions of the U.S. state of New Jersey. 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. Route 39 originally continued westward, crossing the Yardley–Wilburtha Bridge in the community of Wilburtha, New Jersey near State Highway Route 29.

U.S. Route 206 is a 130.23-mile-long (209.58 km) north–south United States highway in New Jersey and Pennsylvania, United States. Only about a half a mile of its length is in Pennsylvania; the Milford–Montague Toll Bridge carries it over the Delaware River into New Jersey, where it connects to the remainder of the route. Its southern terminus is at an intersection with US 30 and Route 54 in Hammonton. The highway's northern terminus is at an intersection with US 209 near Milford, Pennsylvania; some sources and signs show an overlap with US 209 to end at its parent route US 6. For much of its length, US 206 is a rural two-lane undivided road that passes through the Pine Barrens, agricultural areas, and the Appalachian Mountains of northwestern New Jersey, with some urban and suburban areas. The route connects several cities and towns, including Bordentown, Trenton, Princeton, Somerville, Roxbury, Netcong, and Newton. The road is known as the Disabled American Veterans Highway for much of its length.