Past the CR 514 intersection, US 206 makes a curve northeast before heading north again. Leaving the center of Hillsborough, the road runs northeast past more wooded areas as it crosses under Norfolk Southern's Lehigh Line. The route passes more development as it widens into a four lane divided highway with jughandles, turning to the north and passing Duke Gardens. US 206 briefly becomes six lanes wide at the CR 608 intersection before narrowing back to four lanes as it crosses the Raritan River into Somerville. In Somerville, the road runs northwest parallel to the Raritan River prior to turning north into commercial areas and entering Raritan. US 206 runs under NJ Transit's Raritan Valley Line before making a turn to the north-northwest.