Route 159 heads eastward, following a divided Bloomfield Avenue along a commercial strip near the Passaic River.

Nearby to the south are the park's woodlands and to the north, across the divided highway, is a large commercial development.

[3] Along Clinton Road, Route 159 passes some residences to the north, and intersects with Ray Place, which connects to the commercial development to the nearby south.

CR 627 continues the right-of-way as Plymouth Street past the eastern terminus of Route 159.

In 1941, construction finished of a new bypass of the communities of The Caldwells and Fairfield, where Route 159's northern terminus occurs.

Route 6M remained intact for twelve years, when the 1953 renumbering of state highways occurred.