In Eastford, it continues north, crossing US 44 and meeting the west end of Route 244 (an old alignment of US 44) in the center of town.

It then enters the town of Woodstock, where it passes through the western part of town, briefly overlapping Route 171 and crossing Route 197 before continuing north to the Massachusetts state line.

At the south end of the town center, Route 198 has an oblique intersection with Elm Street, and the state highway assumes that name to its northern terminus at Route 131 (Main Street) in the town center.

Between 1932 and 1942, its western terminus was truncated at the Union-Eastford town line.

In 1998, the southern terminus was moved 0.05 miles (0.080 km) north with a rerouting of US 6.